There has been a new GitHub release in April of this year, however, it seems to have been made by a member of the community along with the commit it includes, instead of the original creator.

Edit: There seems to be activity on the author's account which points to the conclusion that they are aware of the issue and are making (still at least somewhat questionable) changes for a new (unreleased?) version of the launcher to address the problem.

https://github.com/Zacam/SBRW.Launcher.Net/commit/f09d911fca...

As far as I am aware the launcher repo I linked in the original post is still the main launcher players use for the game, meaning people are still getting the certificate permanently installed.