There have been a few cases of this that I remember recently. I know in at least one case it was the user’s security software causing it, the folder had to be whitelisted I think. Short on time right now but I can find the exact thread later if needed.
I believe in one earlier case it may have been folder permissions.
If you’re still stuck I can comb thru other ideas a little later.
Update: here it is. Unable to download anything from this browser - #11 by JimB1