I see some similar issues on the tracker but don't seem to me that there is a regression and have a common root because some previous issues like QTCREATORBUG-13868 are about spaces in the path, but I do not use ones in mine build.

Anyway, deploy under fresh QtCreator ends with same error message: When executing step "Copy application data".

I tried to build&deploy on 5.0.0-rc1(which is luckily still available from MaintenanceTool) and everything works like a charm. 

The difference I have noticed between .0-rc1 and .2 during deploy is just in INSTALL_ROOT:

Correct and everything works as expected

...make INSTALL_ROOT=/Users/danilabagroff/Temp/QtCreator/MyApp/Debug-5.15/Android.ARM/android-build install

Wrong `android-build` directory

INSTALL_ROOT=/Users/danilabagroff/Temp/QtCreator/MyApp/Debug-5.15/Android.ARM/./TARGET_FROM_PRO_FILE-armeabi-v7a-build/android-build install

Need to mention that my general .pro is a `subdirs` and include three different .pro files that specify three different(TARGETs are different) `app` but all of them includes the same .pri