Hello everyone,
a strange thing is happening to me when I go to install my Apk. In practice, after installing it and agreeing to update the app, after I go to install the package, a warning informs me that the application has not been installed 
Greetings
Nicola
Perhaps the version of the new application is lower than the old one. Or the application was compiled on a different server and, therefore, with a different keystore.
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However, it should then have a different package name and therefore be able to be installed.
Post a screenshot. And will the app be installed if you uninstall the previous one?
Server code and ai2 have the same package name.
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True, if you signed in there with the same Google account.
I'm trying to simply do an update so I don't lose the data, which is why I didn't try to uninstall the previous one first
Upoad both APKs (the old and the new one) to Google Drive and post the links.
You uploaded an aab file and an apk file... you were supposed to send two apk files, an old one and a new one.
Follow the directions above and provide more details. On what server was the first version of the application built and how was it installed. And on what server was the second version of the application built? Check their version numbers.
Probably your app is not Tinder compatible...
(just joking) 
Taifun
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Unfortunately I carelessly overwrote the old APK with the new one
Not to go into how to manually extract apk from phone however, try using this
P.S. never tried it so don't know how it works
As I don't have a google play account however, shouldn't you be able to download from google an older version.
anyway, here you have other ways to download apk
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Yes, of course!
(...in fact, every app you've ever published)
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In that case he should be able to download an older version for us to test and see what is going on
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One last thing, I assume both versions are directly downloaded from MIT and not one from Google and latest from MIT
In fact, both are downloaded from MIT
Okej, but did you try to extractor APK from your phone with a suggestion above
If you have an apk installed on your device and you made some changes in it, and trying to update it , sometime it will not update due to conflict between packages.
I face same issue sometimes, so you have to uninstall older and install new one and this won't happen with published app on play store, it will update when installed through play store.