I had to validate files. Steam wasn't downloading newly subscribed mods, so validation forced it to.

Yeah... Steam do be lazy with downloading sometimes. Glad you were able to resolve the issue.

Yeah, it aint showing up for me too

So... just a PSA: if the steam is not downloading the mod update - unsubscribing and re-subscribing forces it to download latest version. Also make sure download process is complete before you try to launch the game again.

How is it should look like in server's ini file?
Do I have to repeat workshopID (number) for each modID (string)?

@Bill - no. You only need to mention WorkshopID once so server and clients know that they need this workshop item downloaded.

While modIDs are needed to tell which submods to enable.