Is there a way to get the old version of super kiwi, i was wanting to do some runs of the old versions but it doesn't appear when i try to find it on steam, i just want some help

Best bet would be an earlier version of the game on steam. I know some games let you download previous patches but I'm not sure about all games since I run on Switch myself. If you haven't yet, check with some of the PC runners in the Speedrun Discord Server to see if anyone has any more info for you!