When do Steam Workshop mods download/sync?

I currently have poor internet for downloading games or anything large (i.e. around 150 KB/s maximum download rate).
When I subscribed to a very large Skyrim mod (SMIM) via the Workshop, the mod never got downloaded.
After an hour of playing Skyrim without it, waiting for Skyrim to sync and the works, it never started downloading. Data Files
on Skyrim's launcher showed clear lack of any SMIM .esp files and refused to acknowledge that SMIM wasn't downloaded or installed.
Eventually, I had to unsubscribe on the workshop and download it via the Skyrim Nexus.
I don't want to do this, because I like how easy the Workshop is, especially since I have multiple computers that I play Skyrim on.
This brings me to my question: When does Steam Workshop mods download/sync? Can I force-sync Workshop mods?
Note: The Skyrim launcher didn't work for syncing mods. As a matter of fact, it said I was "All up to date!"
edit: This question is under the assumtion that all Steam workshops are managed the same through the Steam client.
Best Answer
Here is a possible workaround, according to a reddit thread :
Change your download region (Settings >> Downloads >> Download Region), restart Steam. The downloads should start.
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Do Steam workshop mods install automatically?
Steam Workshop Login to Steam in a browser or your Steam Client, navigate to the workshop and subscribe to mod. The mod will be automatically downloaded and updated.How do I force Steam workshop mods to download?
Here's a quick guide on how to do this:Why is Steam workshop not showing mods?
The most common reason is the corrupted files in the Workshop folder. This error can take place randomly. If Steam is refusing to download new mods or updates, this might be the culprit. You would have to find and delete the corrupted mods from the folder.How do I see download progress in Steam workshop?
Go to downloads tab to see how long the download will take. Nothing is shown as downloading but the workshop mods are downloading in the background. Download progress should be displayed with the download speed, estimated time left, and how much MB or GB has been installed.How To Install Mods To Steam Games - Steam Workshop Tutorial
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Answer 2
I had the same problem. My skyrim data files didn't show any mods except dlcs. It is because of the mods don't download to steam/common/skyrim/data file. First of all I unsubscribed all mods than downloaded dawnguard dlc. After that I changed my download region to US New York. Than I restarted my steam. I subscribed my mods. And here we go. My mods are in there data files. Thanks Ealhad.
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