Make sure you have enough free space on your phone, and sometimes APK files need special permissions from your phone to install. It certainly works just fine on android.
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I gave it another chance & was able to install and play it this time, so I'm amending my previous comment. I originally was interested in pursuing Coach Harold, however my first playthrough I unknowingly started Richard's route by helping him each time it asked. Gotta say how surprised i was to see he's not just hard-working but has a twisted sense of humor like I do. Can't wait for more of his route.