diff --git a/app/src/main/java/com/aurora/store/data/providers/PermissionProvider.kt b/app/src/main/java/com/aurora/store/data/providers/PermissionProvider.kt
index 03c6fe474..a9c77c290 100644
--- a/app/src/main/java/com/aurora/store/data/providers/PermissionProvider.kt
+++ b/app/src/main/java/com/aurora/store/data/providers/PermissionProvider.kt
@@ -20,7 +20,6 @@ import com.aurora.extensions.checkManifestPermission
 import com.aurora.extensions.isDomainVerified
 import com.aurora.extensions.isExternalStorageAccessible
 import com.aurora.extensions.isMAndAbove
-import com.aurora.extensions.isOAndAbove
 import com.aurora.extensions.toast
 import com.aurora.store.BuildConfig
 import com.aurora.store.PermissionCallback
@@ -77,10 +76,7 @@ class PermissionProvider : ActivityResultCallback<ActivityResult> {
     private fun knownPermissions(): Map<PermissionType, Intent> {
         return mapOf(
             PermissionType.STORAGE_MANAGER to PackageUtil.getStorageManagerIntent(context),
-            PermissionType.INSTALL_UNKNOWN_APPS to Intent(
-                Settings.ACTION_MANAGE_UNKNOWN_APP_SOURCES,
-                Uri.parse("package:${BuildConfig.APPLICATION_ID}")
-            ),
+            PermissionType.INSTALL_UNKNOWN_APPS to PackageUtil.getInstallUnknownAppsIntent(),
             PermissionType.DOZE_WHITELIST to Intent(
                 Settings.ACTION_REQUEST_IGNORE_BATTERY_OPTIMIZATIONS,
                 Uri.parse("package:${BuildConfig.APPLICATION_ID}")
@@ -122,14 +118,7 @@ class PermissionProvider : ActivityResultCallback<ActivityResult> {
             PermissionType.STORAGE_MANAGER -> context.isExternalStorageAccessible()
 
             PermissionType.POST_NOTIFICATIONS -> context.checkManifestPermission(Manifest.permission.POST_NOTIFICATIONS)
-            PermissionType.INSTALL_UNKNOWN_APPS -> {
-                if (isOAndAbove()) {
-                    context.packageManager.canRequestPackageInstalls()
-                } else {
-                    true
-                }
-            }
-
+            PermissionType.INSTALL_UNKNOWN_APPS -> PackageUtil.canRequestPackageInstalls(context)
             PermissionType.DOZE_WHITELIST -> {
                 if (isMAndAbove()) {
                     val powerManager =
diff --git a/app/src/main/java/com/aurora/store/util/PackageUtil.kt b/app/src/main/java/com/aurora/store/util/PackageUtil.kt
index a8f24e286..9a8ce77b0 100644
--- a/app/src/main/java/com/aurora/store/util/PackageUtil.kt
+++ b/app/src/main/java/com/aurora/store/util/PackageUtil.kt
@@ -144,6 +144,30 @@ object PackageUtil {
         }
     }
 
+    fun getInstallUnknownAppsIntent(): Intent {
+        return if (isOAndAbove()) {
+            Intent(
+                Settings.ACTION_MANAGE_UNKNOWN_APP_SOURCES,
+                Uri.parse("package:${BuildConfig.APPLICATION_ID}")
+            )
+        } else {
+            Intent(Settings.ACTION_SECURITY_SETTINGS)
+        }
+    }
+
+    fun canRequestPackageInstalls(context: Context): Boolean {
+        return if (isOAndAbove()) {
+            context.packageManager.canRequestPackageInstalls()
+        } else {
+            val secureResult = Settings.Secure.getInt(
+                context.contentResolver,
+                Settings.Secure.INSTALL_NON_MARKET_APPS, 0
+            )
+
+            return secureResult == 1
+        }
+    }
+
     @Throws(Exception::class)
     fun getPackageInfo(context: Context, packageName: String, flags: Int = 0): PackageInfo {
         return if (isTAndAbove()) {
diff --git a/app/src/main/java/com/aurora/store/view/ui/details/AppDetailsFragment.kt b/app/src/main/java/com/aurora/store/view/ui/details/AppDetailsFragment.kt
index cbc9bac01..c32818dd2 100644
--- a/app/src/main/java/com/aurora/store/view/ui/details/AppDetailsFragment.kt
+++ b/app/src/main/java/com/aurora/store/view/ui/details/AppDetailsFragment.kt
@@ -632,7 +632,9 @@ class AppDetailsFragment : BaseFragment<FragmentDetailsBinding>() {
                     }
 
                     btn.addOnClickListener {
-                        if (authProvider.isAnonymous && !app.isFree) {
+                        if (!permissionProvider.isGranted(PermissionType.INSTALL_UNKNOWN_APPS)) {
+                            permissionProvider.request(PermissionType.INSTALL_UNKNOWN_APPS)
+                        } else if (authProvider.isAnonymous && !app.isFree) {
                             toast(R.string.toast_purchase_blocked)
                         } else if (app.versionCode == 0) {
                             toast(R.string.toast_app_unavailable)
@@ -641,6 +643,7 @@ class AppDetailsFragment : BaseFragment<FragmentDetailsBinding>() {
                             startDownload()
                         }
                     }
+
                     if (uninstallActionEnabled) {
                         binding.layoutDetailsToolbar.toolbar.invalidateMenu()
                     }
diff --git a/app/src/main/java/com/aurora/store/view/ui/onboarding/PermissionsFragment.kt b/app/src/main/java/com/aurora/store/view/ui/onboarding/PermissionsFragment.kt
index 50af50775..3780c099e 100644
--- a/app/src/main/java/com/aurora/store/view/ui/onboarding/PermissionsFragment.kt
+++ b/app/src/main/java/com/aurora/store/view/ui/onboarding/PermissionsFragment.kt
@@ -23,6 +23,7 @@ package com.aurora.store.view.ui.onboarding
 import android.os.Bundle
 import android.view.View
 import com.aurora.extensions.isMAndAbove
+import com.aurora.extensions.isOAndAbove
 import com.aurora.extensions.isRAndAbove
 import com.aurora.extensions.isSAndAbove
 import com.aurora.extensions.isTAndAbove
@@ -65,7 +66,11 @@ class PermissionsFragment : BaseFragment<FragmentOnboardingPermissionsBinding>()
             Permission(
                 PermissionType.INSTALL_UNKNOWN_APPS,
                 getString(R.string.onboarding_permission_installer),
-                getString(R.string.onboarding_permission_installer_desc)
+                if (isOAndAbove()) {
+                    getString(R.string.onboarding_permission_installer_desc)
+                } else {
+                    getString(R.string.onboarding_permission_installer_legacy_desc)
+                }
             )
         )
 
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 0807d589d..af3b6a4c4 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -198,6 +198,7 @@
     <string name="onboarding_permission_esm">"External Storage Manager"</string>
     <string name="onboarding_permission_installer">"Installer Permission"</string>
     <string name="onboarding_permission_installer_desc">"Allow installing apps from Aurora Store"</string>
+    <string name="onboarding_permission_installer_legacy_desc">"Allow installation of apps from unknown sources"</string>
     <string name="onboarding_permission_notifications">"Notifications"</string>
     <string name="onboarding_permission_notifications_desc">"Send notifications regarding installations status"</string>
     <string name="onboarding_permission_doze">"Background Downloads"</string>