My built Laser Defender apk can't be installed more than one time

I’m delevolping the Laser Defender game from few weeks.
I’ve always installed it on my android phone and on my family and friends too, yesterday it starts to give me a problem on different devices:
When I update the game, it says me “App not installed”, so I uninstall the game and retry, but still the same error message.
Everytime, I can install a my built APK only one time. Then it says me “App not installed”, also if I uninstall it. If I rebuild it with the same settings, however the first time I launch the APK works, then don’t.
If i try with an older APK (built on 10 March), I can install it also 1 thousand of times (also without uninstalling it before). The only thing that I’ve changed is the introduction of “PlayerPrefs” but it is not important, cause I’ve tried commenting the code lines and it however doesn’t work.
I’ve tried setting “Internal” as “Build System” and still doesn’t work…
Thank you so much!

Hi,

Have you already looked for a solution on the internet?

Here are the first three threads that I found:

https://answers.unity.com/questions/719096/android-apk-built-from-unity3d-app-not-installed-e.html

https://forum.unity.com/threads/application-not-installed-error-on-android.193374/

Unluckyly yes, I’ve searched for it for 48h and other. Still I haven’t found a solution…

Unfortunately, developing games for Android is not part of our courses, and I don’t know much about Android. Please feel free to ask our helpful community of students for advice in our official Discord chat.

I believe i may be able to give you a thread you can pull on as it may be that the phones have updated beyond the version of the android APK you are using.
I am pretty sure this is going to be the unity APK vs the kit kat version software.

This link might help as i think its whats happening but i fail to remember how to solve this in unity.

https://stackoverflow.com/questions/4226132/app-not-installed-error-on-android

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