Is there any way to go back to 1.0 beacuse I'm stuck at the newest version

There are ways, but we do not allow submissions of speedruns from the older versions of the game. Only versions that are publicly and easily available without the need of a third party. We used to allow 1.3 and 1.0 submissions when they were available as betas through Steam, but that is no longer the case and as such submissions have been closed for them.

thanks