Title explains itself, can I download older versions of the game? I want to get 0.6.5 because there is a mod I would like to try.
If you're after a specific game, you should ask in that game's comments/community. This category is for discussing itch.io as a whole.
You can only download the files of a game that the developer makes available. If they've removed that version of the game from our servers then there is no way to download it.