You can easily acquire recent builds via my steps here… and it is a simple matter to “reinstate” those builds regardless of how often a game gets patched on Steam - by simply re-copying what you downloaded back over any updates that come thru.
An alternate method would be simply to copy the entire install directory somewhere else and then if the game receives an update you don’t want to jump to, well, simply paste it back in after an update. Which requires a bit of foresight and initiative to do so ahead of time. If you miss that boat, well then, my method above can help you acquire it anyway.