I've had the same issue. If you control security on the PC it's relatively trivial to fix.
To download, I temporarily disabled Defender real-time protection. But it was also blocking Nim from running. You solve that by whitelisting the Nim folder in Defender's settings. Just google for the details if you can't find the settings in Defender. But don't do what I did - I was distracted by working out a fix and downloaded the 32 bit version in error - which led to a mysterious bug...
