First of all, this will be based on this here tutorial, but more specific to this case.
We will be downloading the old files from steam, so you probably need a legit copy of WU (haven't tested on steam account without, though)
1. Locate your desired version of the game.
In this step we'll locate the version we want. If you just want the .dae files, skip this step.
Go to https://steamdb.info/depot/366221/manifests/, (You will need to log in via steam to see most of the older files)
You can find all the versions here, dated, and with the MANIFESTID listed, which we'll use to download them.
I did the research and 2016, jan 28 beta branch uses .wom files, while 2016 jan 28 non-beta branch only uses .dae files
2. Open the Steam console
For this step you'll need to open the steam console, which is normally not visible.
On Windows: open your browser, and in the navbar enter: steam://nav/console
On Linux: opening a terminal and entering
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steam steam://open/console
This should open up the regular steam window, but with a new CONSOLE tab to the right of your profile tab, as such:
3. Download the files
Now that you have the console open, you can start downloading the version by entering this command in the CONSOLE:
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download_depot 366220 366221 1963628778025391472
- download_depot: the command
- 366220: The steam ID of Wurm Unlimited
- 366221: The depot ID of the common files in WU (Not Linux or Windows specific)
- 1963628778025391472: Manifest ID of the files. This specifies which version of the files you want to be downloaded. (It's what we retrieved in step 1)
Note that if you use steam to launch games or your connection goes out for a bit, steam might print a bunch of stuff on the console. As long as the line in step#4 shows up, you're good!
On Windows you should be able to see the network traffic in the downloads manager of steam.
On Linux I had to use iftop to see the traffic:
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sudo iftop
4. Find the files
After it's finished downloading, steam will print a message similar to this one:
From this you can see where the files were downloaded, in my case it's
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/home/tyoda/ ..... /app_366220/depot_366221
If you want to download a different version of the game, remember to rename the downloaded folder "depot_366221" to something like "depot_366221_2016jan28" , so it doesn't get overwritten.