Although singleplayer does work in this version of Sandbot, there are still some problems:
- saved games are corrupted (if you try to load any saves made while Sandbot was installed they will crash the game, or if they do load the scripted events will not work),
- many scripted sequences are broken, preventing progression (for example, the Barney at the end of the tram ride in Half-Life will not move to open the door).
I searched on-line for a solution, and found a Metamod plugin called singlep, which seems to fix these issues.
http://metamod.org/singlep/