Although you changed to a different vpn to make it work again , I can't see how it would be an issue in Nord vpn.
All a vpn does is encrypt your internet connection and replace your ip address of your isp to that of the vpn provider.
Most countries have their content geo blocked if you're outside that location ,so you could be geo blocking yourself unless
it was something else.
So when you said
I can't download when a VPN is turned on ,what was it exactly ?
An error message , download failure.
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A vdh user