I don't think a VPN will solve it, it has something to do with my anti virus software, something happened in the 1.2.6d update that is causing it to be removed by my anti virus software, and no matter what I do I can't change it even when following the given instructions to avoid it.
Oh, sorry, I'm not paying attention. Thought it was a download issue.
I can only assume it's a false positive, I've had that happen once before. You should be able to turn your AV off for the download and turn it back on afterwards.
If you don't want to do that, you could also try downloading and running version 1.2.6c and see if you get the same issue.
1.2.6d only has a single niche fix for imported .glbs models not being centered. So unless you're about to make a custom character with a .glb with an offset pivot model, you don't really need to run 1.2.6d.