Actually, by default, the popup appears every time you close the app, but there's a clear option to suppress it on subsequent occasions for 'this version'. I've

Actually, by default, the popup appears every time you close the app, but there's a clear option to suppress it on subsequent occasions for 'this version'. I've never selected that option, so I'm not sure how fine-grained 'version' is; I actually like seeing the reminder because I will, definitely, one day, make a donation, so I appreciate the prompt!