the paid version is no longer hosted here, but I can't just remove it completely so there's the old pay once vers and this one that links to patreon. The download will keep your save data, it's always safer to do that anyway
the paid version is now patreon only. however they can still download the old paid version to get the 10% exp boost for the first few areas. also the patreon is priced around the number of updates that happened for that version so no one got ripped off(think one guy might have bought a copy later but I do have plans to look them up and email them some bonus in return). ultimately all the updates will eventually be free anyways with the partreon getting some smaller bonuses