Wall Worm does not yet support Source 2. Efforts to add Source 2 support have already started, but it is still in the early days. There is no ETA on the Source 2 support in Wall Worm.
Important Information on CS:GO
Valve has ported Counter-Strike: Global Offensive to Source 2 and removed the Source version of CS:GO from Steam. As such, projects previously set up for CS:GO in Wall Worm will cease to work when Steam updates on your system. This is an unfortunate situation for some users. Understandably, some users will be frustrated and expect their projects to work as they have for years. Despite the frustration, I ask that users do not direct their frustration at me or Wall Worm, as it will not make me be able to complete the addition of Source 2 support any faster. I've been actively supporting this community since 2010, and I intend to continue my work on Wall Worm--I just don't have the time to devote specifically to Wall Worm since moving my career to Autodesk. At this time, Wall Worm is a weekend project for me.
How to revive a project started in CS:GO after the update to Source 2 in Counter-Strike 2.
Instructions on using Wall Worm Projects configured for Counter-Strike: Global Offensive after the release of Counter-Strike 2 on the Source 2 engine.