First, let's address the typo: is almost certainly a keyboard encoding error for "Garry's Mod" (where the apostrophe ' is misrepresented as 39 in ASCII/URL encoding).
The biggest hurdle for new players trying to access is the content pack fragmentation. Unlike standard GMod, SSR requires specific assets that are not on the Steam Workshop.
While the SSR patch fixes many launch issues, players are warned that the multiplayer environment is very insecure and should only be used on private servers with trusted friends. Compatibility
Projects like SSR focus heavily on restoring multiplayer functionality, allowing you to play classic modes like Prop Hunt V2 Trouble in Terrorist Town (TTT) V1 Zombie Survival as they originally played. Niche Content Preservation: