I can't figure out how to launch the stetchkov syndicate expansion. I remember it having a seperate launcher when I was a kid.

Look for SWAT4X.EXE file inside the Contentsexpansion directory in the game folder.

Alternatively on Galaxy you have a "more" drop down box to enable you to launch it.

Thanks for the info.
By default the game should start with the extension SS
Gog should change that.

TSS has it's own SP campaign apart from vanilla SWAT4. The vanilla SWAT 4 campaign does not carry into TSS (Although the maps are available for MP). Need mods like Elite Force Mod to play vanilla SWAT 4 campaign in TSS (allowing for new stuff in TSS in to be used in vanilla SP campaign).

Basically, without mods, players have to run SWAT4 or SWAT4X to choose the campaign they want to play.

I just installed the GOG version,and the game created desktop icons for both the main game and the expansion.