IF you want to get a build from a specific timethat isnt mentioned here, then this is a guide of instructions that... if im honest, either do a better job of explaining the proccess than I would, or would be a source that id plagiarise.
https://steamproxy.net/sharedfiles/filedetails/?id=2388404417
The rest of this guide will be console commands to run to download specific builds, as well as a bit of detail of those builds.

Go to any web browser and put this in the url:
steam://open/console

If it prompts you to open steam or an external application, allow it.


Also remember, when running any "download_depot" command, steam will not show download progress. Use Task manager (or something similar) to monitor network usage in order to verify that its downloading. Either that, or just repeadedly scan the download location to see it grow.

download_depot 1292040 1292041 8663312081235841185
THis is before 9.0 ( i think), but also a bit earlier since the builds after this one were mostly just the addition of christmass decor.
I think its stable in both Endless and Arena.

download_depot 1292040 1292041 5342495730967867330
More up to date than "Classic (Pre Winter)" but has Christmass decor always on.
I dont know what is patched with this build that isnt in the pre winter build, but i aint convinced its nothing.
I have not tested this enough yet to know if it is stable in Endless. I can confirm Arena is stable.

download_depot 1292040 1292041 5825191338541112681
pre September 15 2022
After 9.0. Maybe even just 9.0.
This is one of the first builds after questification. I archived it because it is one of if not the only builds with the "Hook the Drone" objective in Arena.
Needless to say, Arena is stable. Endless is probably stable, but I dont remember caring enough to try.