currently playing on .8.2c and want to download .9.0n without losing access to .8.2c. how would I go about that? this is also my first time downloading a newer version of VoTV so I don't know how this works

Create 2 new folders, one for save backups, the other for the new version. Download the new version and save it to the designated folder. BEFORE launching the new version, go to (C:)/Users/(YourUsername)/AppData/Local/VotV/Saved (assuming you're on Windows) and copypaste the "SaveGames" folder to your backups folder,  just incase you ever want to revisit the previous versions. At least, that's how I do it.