To clarify, they were requested to do so by Steam as they will only support so many "beta" entries in the Betas tab of any one game. So they picked the versions with the lowest user counts.
As mentioned before not every version exists, as there is a limit of how many can be provided
With HOI4 only 1.10.5 is provided, then older ones from 1.9.3 back. If you have a mod that requires 1.10.4 it will need to be updated by its author to work with later game versions.
Those codes are only necessary for game versions more than about 2 years old, before GDPR.
If you know what date you last played you could check the patch release list:
Whichever game you are referring to, please post in its tech support forum. Thanks.
What can you see?
First, these games are not Skyrim, even vanilla experience is quite friendly. Second and more important, few modders actually need roll-backs. Third...
Why would you be able? Betas don't store all the versions, only high moments, like, before huge, save-game-breaking patches. There's a hard limit by Steam on how many betas can be stored for a game.
This. You've never been able to roll back to previous subversions of a patch. Not even in the pre steam days where the patches were upladed to the fora.
