As a supplementary version to prevent some users from being unable to open the game, users can choose between version selection in V2.49 and V2.49B. If you can open the game normally, there is no need to select a version.
V2.49B
Source: Steam Community (opens in a new tab)
Build and release context
Steam update times within 24 hours of this post. Matching dates do not confirm which build it describes.
Build 18098579 · public branch
Steam updated · First observed
Build 18098579 · v249b_250414 branch
Steam updated · First observed