I downloaded Mod 1 as well. I installed both the apk and game cache correctly but I kept on getting the error "failed to sign in. Please check your network connection and try again." I tried reinstalling as well but I still get the same error.
I was able to install it but my phone detects it as malware and I couldn't find it anywhere on my phone. Tried signing the apk as well but still encountered the same problem :(