Been having a problem for about 6 months where attempting to update games gave me errors.

Content unavailable
Content servers unreachable

Both seemed to show up for whatever was trying to update games, but I could still download and run games, as well as download/update mods.

Strangely, considering the errors, Steam seems to download perfectly fine until it gets to the last few percent of the download and decides to just stop, wait for a minute or two, and then give the error.

Now I'm not able to download games anymore either.

The only thing that properly finishes downloading is the Steamworks common redistributables download.

I've tried the following multiple times:
Clearing my download cache
Changing my download region (a few times)
Deleting and reinstalling Steam
Deleting the steamapps folder
Making sure nothing is write-protected
Starting Steam as an administrator

Not really sure where else to go from here. Any help would be appreciated.