Purchased "Life-Time Access", can't play... – Gun Disassembly 2 Review

I purchased this game 3-4 years ago now and am now being told that my account isn't being found...no matter how many times I delete the app and re-download it, enter my email address to find my account...nothing... I'd hate to think my $50 has been wasted...I really liked this app... Is there's something I'm not doing right please inform me...
Review by SGTChurch on Gun Disassembly 2.