diff --git a/app/src/main/assets/pl-changelog.html b/app/src/main/assets/pl-changelog.html
index af4aaca4..173d3877 100644
--- a/app/src/main/assets/pl-changelog.html
+++ b/app/src/main/assets/pl-changelog.html
@@ -1,8 +1,6 @@
-<h3>Wersja 4.13.6, 2023-03-24</h3>
+<h3>Wersja 4.13.7, 2024-07-08</h3>
 <ul>
-    <li>Naprawiono pobieranie załączników na Androidzie 13 i nowszym.</li>
-    <li>Dodano opcję odświeżenia planu lekcji na wybrany tydzień.</li>
-    <li>Usunięto błędy logowania. @BxOxSxS</li>
+    <li>Dodano opcję uruchomienia aplikacji bez logowania.</li>
 </ul>
 <br>
 <br>
diff --git a/app/src/main/cpp/szkolny-signing.cpp b/app/src/main/cpp/szkolny-signing.cpp
index 9ae8f745..089e9025 100644
--- a/app/src/main/cpp/szkolny-signing.cpp
+++ b/app/src/main/cpp/szkolny-signing.cpp
@@ -9,7 +9,7 @@
 
 /*secret password - removed for source code publication*/
 static toys AES_IV[16] = {
-	0x6d, 0xa5, 0x32, 0xe6, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff  };
+	0x0e, 0x87, 0x6d, 0xaa, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff  };
 
 unsigned char *agony(unsigned int laugh, unsigned char *box, unsigned char *heat);
 
diff --git a/app/src/main/java/pl/szczodrzynski/edziennik/data/api/edziennik/EdziennikTask.kt b/app/src/main/java/pl/szczodrzynski/edziennik/data/api/edziennik/EdziennikTask.kt
index 97c42482..ad52ba1c 100644
--- a/app/src/main/java/pl/szczodrzynski/edziennik/data/api/edziennik/EdziennikTask.kt
+++ b/app/src/main/java/pl/szczodrzynski/edziennik/data/api/edziennik/EdziennikTask.kt
@@ -9,6 +9,7 @@ import org.greenrobot.eventbus.EventBus
 import pl.szczodrzynski.edziennik.App
 import pl.szczodrzynski.edziennik.R
 import pl.szczodrzynski.edziennik.data.api.ERROR_PROFILE_ARCHIVED
+import pl.szczodrzynski.edziennik.data.api.edziennik.demo.Demo
 import pl.szczodrzynski.edziennik.data.api.edziennik.librus.Librus
 import pl.szczodrzynski.edziennik.data.api.edziennik.mobidziennik.Mobidziennik
 import pl.szczodrzynski.edziennik.data.api.edziennik.podlasie.Podlasie
@@ -120,6 +121,7 @@ open class EdziennikTask(override val profileId: Int, val request: Any) : IApiTa
             LoginType.PODLASIE -> Podlasie(app, profile, loginStore, taskCallback)
             LoginType.TEMPLATE -> Template(app, profile, loginStore, taskCallback)
             LoginType.USOS -> Usos(app, profile, loginStore, taskCallback)
+            LoginType.DEMO -> Demo(app, profile, loginStore, taskCallback)
             else -> null
         }
         if (edziennikInterface == null) {
diff --git a/app/src/main/java/pl/szczodrzynski/edziennik/data/api/edziennik/demo/Demo.kt b/app/src/main/java/pl/szczodrzynski/edziennik/data/api/edziennik/demo/Demo.kt
new file mode 100644
index 00000000..0d24e882
--- /dev/null
+++ b/app/src/main/java/pl/szczodrzynski/edziennik/data/api/edziennik/demo/Demo.kt
@@ -0,0 +1,84 @@
+/*
+ * Copyright (c) Kuba Szczodrzyński 2024-7-8.
+ */
+
+package pl.szczodrzynski.edziennik.data.api.edziennik.demo
+
+import com.google.gson.JsonObject
+import org.greenrobot.eventbus.EventBus
+import pl.szczodrzynski.edziennik.App
+import pl.szczodrzynski.edziennik.data.api.events.FirstLoginFinishedEvent
+import pl.szczodrzynski.edziennik.data.api.interfaces.EdziennikCallback
+import pl.szczodrzynski.edziennik.data.api.interfaces.EdziennikInterface
+import pl.szczodrzynski.edziennik.data.db.entity.LoginStore
+import pl.szczodrzynski.edziennik.data.db.entity.Profile
+import pl.szczodrzynski.edziennik.data.db.entity.Teacher
+import pl.szczodrzynski.edziennik.data.db.full.AnnouncementFull
+import pl.szczodrzynski.edziennik.data.db.full.EventFull
+import pl.szczodrzynski.edziennik.data.db.full.MessageFull
+import pl.szczodrzynski.edziennik.data.enums.FeatureType
+import pl.szczodrzynski.edziennik.data.enums.LoginType
+
+class Demo(
+    val app: App,
+    val profile: Profile?,
+    val loginStore: LoginStore,
+    val callback: EdziennikCallback,
+) : EdziennikInterface {
+
+    private fun completed() {
+        callback.onCompleted()
+    }
+
+    override fun sync(
+        featureTypes: Set<FeatureType>?,
+        onlyEndpoints: Set<Int>?,
+        arguments: JsonObject?,
+    ) = completed()
+
+    override fun getMessage(message: MessageFull) =
+        completed()
+
+    override fun sendMessage(recipients: Set<Teacher>, subject: String, text: String) =
+        completed()
+
+    override fun markAllAnnouncementsAsRead() =
+        completed()
+
+    override fun getAnnouncement(announcement: AnnouncementFull) =
+        completed()
+
+    override fun getAttachment(owner: Any, attachmentId: Long, attachmentName: String) =
+        completed()
+
+    override fun getRecipientList() =
+        completed()
+
+    override fun getEvent(eventFull: EventFull) =
+        completed()
+
+    override fun firstLogin() {
+        val profile = Profile(
+            id = loginStore.id,
+            loginStoreId = loginStore.id,
+            loginStoreType = LoginType.DEMO,
+            name = "Jan Szkolny",
+            subname = "Szkolny.eu",
+            studentNameLong = "Jan Szkolny",
+            studentNameShort = "Jan S.",
+            accountName = null,
+        )
+        profile.apply {
+            empty = false
+            syncEnabled = false
+            registration = Profile.REGISTRATION_DISABLED
+            studentClassName = "1A"
+            userCode = "nologin:1234"
+            dateYearEnd.month = 8
+        }
+        EventBus.getDefault().postSticky(FirstLoginFinishedEvent(listOf(profile), loginStore))
+        completed()
+    }
+
+    override fun cancel() {}
+}
diff --git a/app/src/main/java/pl/szczodrzynski/edziennik/data/api/szkolny/interceptor/Signing.kt b/app/src/main/java/pl/szczodrzynski/edziennik/data/api/szkolny/interceptor/Signing.kt
index 0d1fed43..507d2e4c 100644
--- a/app/src/main/java/pl/szczodrzynski/edziennik/data/api/szkolny/interceptor/Signing.kt
+++ b/app/src/main/java/pl/szczodrzynski/edziennik/data/api/szkolny/interceptor/Signing.kt
@@ -47,6 +47,6 @@ object Signing {
 
     /*fun provideKey(param1: String, param2: Long): ByteArray {*/
     fun pleaseStopRightNow(param1: String, param2: Long): ByteArray {
-        return "$param1.MTIzNDU2Nzg5MD01uMP7oW===.$param2".sha256()
+        return "$param1.MTIzNDU2Nzg5MD0WAYwfGc===.$param2".sha256()
     }
 }
diff --git a/app/src/main/java/pl/szczodrzynski/edziennik/data/enums/LoginMode.kt b/app/src/main/java/pl/szczodrzynski/edziennik/data/enums/LoginMode.kt
index 2bc36605..e590c448 100644
--- a/app/src/main/java/pl/szczodrzynski/edziennik/data/enums/LoginMode.kt
+++ b/app/src/main/java/pl/szczodrzynski/edziennik/data/enums/LoginMode.kt
@@ -17,4 +17,5 @@ enum class LoginMode(
     VULCAN_HEBE(LoginType.VULCAN, id = 402),
     PODLASIE_API(LoginType.PODLASIE, id = 600),
     USOS_OAUTH(LoginType.USOS, id = 700),
+    DEMO(LoginType.DEMO, id = 800),
 }
diff --git a/app/src/main/java/pl/szczodrzynski/edziennik/data/enums/LoginType.kt b/app/src/main/java/pl/szczodrzynski/edziennik/data/enums/LoginType.kt
index 1709d160..f39f42c6 100644
--- a/app/src/main/java/pl/szczodrzynski/edziennik/data/enums/LoginType.kt
+++ b/app/src/main/java/pl/szczodrzynski/edziennik/data/enums/LoginType.kt
@@ -14,7 +14,7 @@ enum class LoginType(
     VULCAN(id = 4, features = FEATURES_VULCAN),
     PODLASIE(id = 6, features = FEATURES_PODLASIE),
     USOS(id = 7, features = FEATURES_USOS, schoolType = SchoolType.UNIVERSITY),
-    DEMO(id = 20, features = setOf()),
+    DEMO(id = 8, features = setOf()),
     TEMPLATE(id = 21, features = setOf()),
 
     // the graveyard
diff --git a/app/src/main/java/pl/szczodrzynski/edziennik/ext/ProfileExtensions.kt b/app/src/main/java/pl/szczodrzynski/edziennik/ext/ProfileExtensions.kt
index 601b49af..116afc2d 100644
--- a/app/src/main/java/pl/szczodrzynski/edziennik/ext/ProfileExtensions.kt
+++ b/app/src/main/java/pl/szczodrzynski/edziennik/ext/ProfileExtensions.kt
@@ -17,6 +17,7 @@ import pl.szczodrzynski.edziennik.R
 import pl.szczodrzynski.edziennik.data.config.AppData
 import pl.szczodrzynski.edziennik.data.db.entity.Profile
 import pl.szczodrzynski.edziennik.data.enums.FeatureType
+import pl.szczodrzynski.edziennik.data.enums.LoginType
 import pl.szczodrzynski.edziennik.utils.ProfileImageHolder
 import pl.szczodrzynski.edziennik.utils.models.Date
 import pl.szczodrzynski.navlib.ImageHolder
@@ -71,6 +72,8 @@ fun Profile.getAppData() =
     if (App.profileId == this.id) App.data else AppData.get(this.loginStoreType)
 
 fun Profile.shouldArchive(): Boolean {
+    if (loginStoreType == LoginType.DEMO)
+        return false
     // vulcan hotfix
     if (dateYearEnd.month > 6) {
         dateYearEnd.month = 6
diff --git a/app/src/main/java/pl/szczodrzynski/edziennik/ui/login/LoginChooserFragment.kt b/app/src/main/java/pl/szczodrzynski/edziennik/ui/login/LoginChooserFragment.kt
index f013b218..48853da7 100644
--- a/app/src/main/java/pl/szczodrzynski/edziennik/ui/login/LoginChooserFragment.kt
+++ b/app/src/main/java/pl/szczodrzynski/edziennik/ui/login/LoginChooserFragment.kt
@@ -209,7 +209,7 @@ class LoginChooserFragment : Fragment(), CoroutineScope {
             adapter.items.removeAll { it !is LoginInfo.Register }
             adapter.items.add(
                     LoginInfo.Register(
-                            loginType = LoginType.DEMO,
+                            loginType = LoginType.TEMPLATE,
                             registerName = R.string.eggs,
                             registerLogo = R.drawable.face_1,
                             loginModes = listOf(
@@ -253,13 +253,13 @@ class LoginChooserFragment : Fragment(), CoroutineScope {
             loginType: LoginInfo.Register,
             loginMode: LoginInfo.Mode
     ) {
-        if (loginType.loginType == LoginType.DEMO) {
-            nav.navigate(R.id.loginEggsFragment, null, activity.navOptions)
-            return
-        }
-
         if (loginType.loginType == LoginType.TEMPLATE) {
-            nav.navigate(R.id.labFragment, null, activity.navOptions)
+            when (loginType.registerName) {
+                R.string.eggs ->
+                    nav.navigate(R.id.loginEggsFragment, null, activity.navOptions)
+                R.string.menu_lab ->
+                    nav.navigate(R.id.labFragment, null, activity.navOptions)
+            }
             return
         }
 
diff --git a/app/src/main/java/pl/szczodrzynski/edziennik/ui/login/LoginInfo.kt b/app/src/main/java/pl/szczodrzynski/edziennik/ui/login/LoginInfo.kt
index 1dd479dc..7d43dc0a 100644
--- a/app/src/main/java/pl/szczodrzynski/edziennik/ui/login/LoginInfo.kt
+++ b/app/src/main/java/pl/szczodrzynski/edziennik/ui/login/LoginInfo.kt
@@ -328,6 +328,21 @@ object LoginInfo {
                     ),
                 ),
             ),
+            Register(
+                loginType = LoginType.DEMO,
+                registerName = R.string.login_type_demo,
+                registerLogo = R.mipmap.ic_launcher_v5,
+                loginModes = listOf(
+                    Mode(
+                        loginMode = LoginMode.DEMO,
+                        name = R.string.login_mode_demo,
+                        icon = R.mipmap.ic_launcher_v5,
+                        guideText = R.string.login_mode_demo,
+                        credentials = listOf(),
+                        errorCodes = mapOf(),
+                    ),
+                ),
+            ),
         )
     }
 
diff --git a/app/src/main/res/values-en/strings.xml b/app/src/main/res/values-en/strings.xml
index 0fd6ed3d..cc26718f 100644
--- a/app/src/main/res/values-en/strings.xml
+++ b/app/src/main/res/values-en/strings.xml
@@ -1434,4 +1434,6 @@
     <string name="menu_agenda_config">Agenda settings</string>
     <string name="registration_config_note_sharing_title">Share notes</string>
     <string name="home_timetable_all_lessons">All lessons:</string>
+    <string name="login_type_demo">Use without login</string>
+    <string name="login_mode_demo">Demo version</string>
 </resources>
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 3d52b857..2d485468 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -1554,6 +1554,8 @@
     <string name="home_timetable_all_lessons">Wszystkie lekcje:</string>
     <string name="agenda_config_subject_important">Wyświetl nazwę przedmiotu zamiast rodzaju</string>
     <string name="menu_timetable_sync">Odśwież wybrany tydzień</string>
+    <string name="login_type_demo">Użyj bez logowania</string>
+    <string name="login_mode_demo">Wersja demonstracyjna</string>
     <string name="theme_default">Zwyczajny</string>
     <string name="theme_teal">Morski</string>
     <string name="theme_green">Zielony</string>
diff --git a/build.gradle b/build.gradle
index d4c8087d..4f0dfc8d 100644
--- a/build.gradle
+++ b/build.gradle
@@ -5,8 +5,8 @@ buildscript {
         kotlin_version = '1.9.24'
 
         release = [
-                versionName: "4.13.6",
-                versionCode: 4130699
+                versionName: "4.13.7",
+                versionCode: 4130799
         ]
 
         setup = [