| Install blocked or "your phone cannot install unknown apps" |
The browser or file manager that opened the file has no install permission. Android 8.0 and newer grant it per app, not once for the whole phone. |
Go back to Settings, Apps, Special access, Install unknown apps, and allow the exact app that opened the file. If you tapped the file from a chat app, allow that app instead of the browser. |
| Parse error or "there was a problem parsing the package" |
The download stopped early, so the file is smaller than 58 MB, or the phone runs an Android build older than 8.0. |
Delete the file, check free storage, then download again on Wi-Fi. Compare the finished size with 58 MB. Still failing on an old phone means the app cannot run there. |
| App not installed with no other detail |
An older okbijoy copy is already on the phone, signed differently, or a second copy sits in a dual-app space. |
Uninstall every okbijoy entry you can see, restart the phone, then install the fresh APK. Do not install over the old one and hope it replaces it. |
| Not enough storage |
Less than about 250 MB free. Photos, video and cached apps fill the space the installer needs. |
Clear caches in Settings, move photos to a memory card, then retry. Restarting before a second attempt helps when the first one left a partial file behind. |
| Download keeps restarting or the file saves as .zip |
A weak mobile signal, or the browser renaming the file on a partial transfer. |
Switch to Wi-Fi, clear the browser download list, and fetch the file once more. The saved name must end in .apk. A .zip or .apk.1 ending means the transfer broke. |