You can also download map files from the server manually via, e.g., a web browser and get unlimited downloads that way. Don't need to pay for the standard functionality no matter where you downloaded the apk.

OsmAnd is free-as-in-beer if you want it to be, though imo that's not fair to the developers unless you truly can't afford a few euros (which can be, no judgement, especially in countries with lower incomes or high income disparity).