for some reason update.bat doesn't update bunnymod XT. Also im on Windows 8.1 Im saying it cause I don't know it might have something to do with it. And I don't know if I should upload those runs

It's easy to update it manually. Download a newer version of it from the resources tab. The link is the one at the top and once you downloaded it just overwrite the older DLL file with the new one. :) Don't care about the "last updated" thing on this site because when you click the link then you will see that it was updated this year's march.