Troubleshooting
APK Won’t Install on Android: Match the Error, Then Fix It
The error message tells you which of five causes you have. Match it first, then fix it, because re-downloading rarely helps.
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The error message is the diagnosis
| Message | Cause | Fix |
|---|---|---|
| App not installed | Signature conflict with an existing package | Uninstall the existing copy, then install again |
| There was a problem parsing the package | Truncated or incomplete download | Re-download the file completely |
| Not enough space | Insufficient storage for three times the file size | Free space, then retry |
| App blocked by Play Protect | The system scanner flagged the file | Decide deliberately; do not simply override |
| App not compatible | Minimum version or architecture mismatch | The device cannot run this build |
| Install cancelled | Unknown sources not allowed for this app | Enable the permission and retry |
Why a signature conflict looks like a corrupt file
Android will not replace an installed package with one signed by a different key. When it refuses, the download has already completed, so it is tempting to blame the file and download it again. Doing that repeats the same conflict. The message is telling you the file is fine and the package already present is the obstacle.
How to work through an install failure
1.Read the error and match it above
The message narrows five possibilities to one, which is faster than trying fixes at random.
2.Check that unknown sources is allowed
A build can only install if the setting permits installation from unknown sources for the app doing the installing.
3.Free the storage three times the file size
Android needs the download, the extracted install and the optimised code to coexist while installation completes.
4.Uninstall a conflicting package, then retry
A differently-signed copy already present is the usual cause of a repeated refusal rather than a damaged download.
When re-downloading helps and when it does not
Frequently asked questions
Worth knowing: "App not installed" after a completed download is almost always a signature conflict with an existing package, not a corrupt file.