Ever since the update that killed the vgui steam overlay, the steam overlay basically doesn't work on pre-2.0.4.1 versions of L4D2 (and possibly L4D1 1.0, didn't check). Sometimes stuff that you previously had open will show in the overlay, but you can't really interact with it, clicking stuff like 'invite friends' ingame doesn't work, etc. All of this stuff works fine in >=2.0.4.5 (presumably 2.0.4.1 as well but literally who cares)
Ever since the update that killed the vgui steam overlay, the steam overlay basically doesn't work on pre-2.0.4.1 versions of L4D2 (and possibly L4D1 1.0, didn't check). Sometimes stuff that you previously had open will show in the overlay, but you can't really interact with it, clicking stuff like 'invite friends' ingame doesn't work, etc. All of this stuff works fine in >=2.0.4.5 (presumably 2.0.4.1 as well but literally who cares)