Is this an old version? Because there's a big red button on the top that says "Update". Also, I tried downloading a game to see if it worked without updating but it didn't let me. So, I updated it but the same message from above popped out again.

“It looks like there is something wrong with your install. Uninstall SideQuest and select "yes" when asked to delete app data and then install again. You may need to move your backup apks.”