Is it Against Rules to Install MyRAFAC from an APK

I am flying on the 11th and kinda need MyRAFAC to work, thing is it only works with android 15, android 17 and some versions of android 16, thing is, I am on the wrong version of android 16 and android 17 hasnt been rolled out to pixel 7a

There is an APK online that is the current version of MyRAFAC and does work on my version of android.

So would I get in trouble if I used it from an APK? or am I better of buying an old android that can run MyRAFAC.