This thread is for games supported by the PM Injector program. That program works with games from the Play Store.
I believe you want a modded apk, that's available in this thread.
Sorry if I'm being stupid, but under free download it says:
"
Original APK: PASTE_LINK_HERE (please use upload services auch as apkadmin.com or sharemods.com)
PM Injector Download: PM Injector App
"
I have downloaded the injector, but where is the apk?