Downloading Steam Workshop Mods to GOG

This is a simple tutorial designed to run GOG users through downloading mods from the Steam Workshop for their version of the game.

Preparation

Before we begin, you will need to acquire a Valve tool called SteamCMD. You can download that here.

Once you have downloaded and extracted the zip file, you will be presented with the file SteamCMD.exe. This is the program we’ll be using; make sure it's in a folder of its own and run it, and you’ll be presented with a command prompt window. If you've never used SteamCMD it will run a series of updates first.

Login

The first thing you’ll need to do is log in. If you have a Steam account then great, you can use that, but this tutorial will guide you through logging in anonymously. Type the following, then hit return:

login anonymous

The program should respond with the following:

Connecting anonymously to Steam Public...Logged in OK
Waiting for user info...OK

If you have an account you can use the following:

login {username} {password}

SteamCMD is supposed to allow you to enter your password separately but that currently seems to cause it to freeze, and for obvious reasons entering your password plaintext in what could be a room full of people is less than ideal. Logging in anonymously is quicker, easier and more secure so I'd recommend that.

Gathering IDs

You now need two numbers; the AppID for the game and the Workshop ID of the mod you want. The game's AppID is 301650, and you can find the Workshop ID from the URL of the mod's workshop page like so:

http://steamcommunity.com/sharedfiles/filedetails/?id=656993383&searchtext=

The ten-digit number where it says "?id=" is the number you want. So, for this mod, the AppID is 301650 and the Workshop ID is 656993383.

Downloading

Now you can return to SteamCMD and tell it which workshop item to download using the following command:

workshop_download_item {AppID} {WorkshopID}

Which of course in our case is...

workshop_download_item 301650 656993383

You should see the following confirmation message:

Success. Downloaded item 656993383 to "[...]\steamapps\workshop\content\301650\656993383" ([...] bytes)

The attached screenshot shows my copy of SteamCMD just after completing of the above download.

Transfer to GOG

The exact directory will change based on where you put SteamCMD and the filesize will of course vary based on which item you downloaded. Either way, you will now need to navigate to the folder you've just created - if you put SteamCMD in a folder of its own, you should easily be able to locate the /steamapps/ folder that is now alongside it.

Each mod you download like this will create their own folder within the /301650/ directory. They'll each take the mod's Workshop ID as their name, but be warned that renaming them will break multiplayer compatibility. To move them into the GOG version, simply copy-and-paste the mod's folder and all files within it to the /mods/ directory within your game install.

[SgtQuadratEnte]

As AVIASVIN pointed out, sometimes you need to actually own the game to be able to download it.
Arma 3 is also one of these cases.
Just login with your username/password and confirm this with your 2FA
login username password

[AVIASVIN]

To make it clear: Not all games allow downloading workshop items as Anonymous user, you have to have an account with that game to download from it's workshop. For example, Paradox Interactive games, such as Stellaris or Crusader Kings, are not downloadable as Anonymous.

[The Danixs]

Access Denied Because?

[Hachager]

I got a timeout issue how should i solve this ?

[mraburski]

It's not working for me - Forager (https://steamcommunity.com/app/751780)
for Fast crafting (https://steamcommunity.com/sharedfiles/filedetails/?id=1974431336)

I tried anonymous and logged in approach.

I get enigmatic "Download item failed (Failure)"

Any help/tips, guys?

[Nielk1]

To make sure this is clear: I worked with Rebellion and Big Boat to make sure anonymous download of the workshop items would work for BZCC and BZ98R. The back end has to be configured a specific way for this to be possible and I had to rely instructions from some indie devs I know to get everything squared away right. Most games do not allow anonymous downloads of mods from the workshop.

[dabmic]

hi- i noticed- DO NOT login to your steam account- if you login to anonymous- it will work. on your account- timeout error , whatever crup- doesn work.

[⨗]

You're actually a god among men for this one, chief. Thanks.

[Skalo]

ERROR! Download item 725611868 failed (Timeout).
HELP!!!!

[doma󠁳⁧⁧[1g]]

Steam>workshop_download_item 4000 785033881
Downloading item 785033881 ...
ERROR! Download item 785033881 failed (Failure).