I would use nak to do this.

https://github.com/fiatjaf/nak

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Thanks for responding, Derek.

Downloaded but it's beyond me technically. Archive utility icon flashes. Unzipped folder. 24 items.

Any simple YT tutorials you're aware of?

I tried rot13maxi program too. Similar issue.

Better to create a new key pair?

How the heck did I convert this? I have the npub saved in the same place as my hex string in the belief that it was my private key! 😏 🙄