So, I released my game a little bit ago. I'm currently working on a prototype for my next title, but after that I want to do a few more updates. One of these is to release an ad-enabled, free version of the game. I had this working originally but pulled the free version due to an issue with MonoGame. Someone was able to help me work around this but by then I had already shelved the feature and planned to come back to it after release.
My original plan was to just have another copy of the game, but then it occurred to me that I could just integrate the ad functionality and drop the price to zero, offering an in-app purchase to disable ads. Of course, I don't want to screw over those nice few (and awesome) folks who supported my initial release so I would want to detect whether or not someone had already purchased the game prior to the "free" release and just automatically give them the ad-free license.
Unfortunately, I can't think of a way to do this within my current skill set and I'm kind of coming up blank on the google search terms. I've tried a couple things but they don't seem right and I'm not getting anything even remotely close to what I'm wanting anyway.
Anybody have any thoughts here? It's not really a blocker, I can always just release a separate, free version. I'm not too worried about it... I can just put this in the column of things to learn from and improve upon next time, I was just wondering if anybody had run into this or had any ideas.