Demo works, paid full version wont open games?

[RussianBiohazZzard]

Hi, I recently downloaded the Drastic DS emulator on my Chromo Inc 7 inch tablet. 1.2 ghz processor, 512 MB of DDR3 RAM. The demo ran just fine on my device, then i decided to get a Google Play card and spend $6 to get the full version, and it wont open my games. It just crashes every time I TRY to open a game file. I re downloaded the demo, and it still works fine, so I know its nothing with my device, but something with the emulator itself. PLEASE HELP ASAP!!!!!!