I did this little thing when pubg couldn't open the other day. Steam downloaded needed files and game working perfectly ever since.
So tried to do same with worms, just for fun. And it actually did find something to download:
Anyone have any idea what this could be? Maybe fix for win10 haha
Anyway, if you have problems with any of the steam games, do these steps:
library / right click on game name / properties / local files / verify integrity of game files After that, let steam do it's job for ~1 minute.
Hope it helps someone.