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Help! App not installed as app isn't compatible with your phone. Al

Why is it I can download and install game from playstore bu when I try to install a mod apk of exact game and version I get the message

If your phone is 64bit then PlayStore will download the 64bit version of the apk, where as the mod apk is likely made for 32bit. Since newer phones are dropping support for 32bit completely, means you won't be able to install 32bit apks.