I released a game about 5 years ago across multiple mobile platforms. I spent a couple of years supporting it, following user feedback and trying to improve its revenue unsuccessfully. In the end, I just patched all the holes I could and left it be.
Recently, I started getting a bunch of support requests for android. I don't know if it's an OS update clashing, or what, but I'm unable to do anything about it. I switched version control and backups a while (2 years or so) ago, and the earliest version of the code I have access to is from part way into a major overhaul and work on a sequel that I decided wasn't sustainable. In order to issue fixes I would need to finish the overhaul and there's no way I can afford to do that.
So... what is the best way to handle this? I was thinking of issuing refunds to the people with support requests and un-publishing from the store fronts. However, I don't want people who've just bought it to see it suddenly vanish. That's only an issue for Google Play (I don't really get any sales anywhere else now). I'm not sure if making the game unlisted would still allow players to access it from the "My Apps & Games" section in Google Play, or if any would realise if they could. Is there a better way?