I've found a payment from "Stuart Knight" from the October with an address containing "empty eyes". If that's your address, you need to fill in your postal address as documented here:
https://winscp.net/eng/docs/updates#automatic_upgrade
The error message you are getting, should point your there too.

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What is your PayPal address? I was not able to find a payment from the email address you have used to register on this forum. If you do not want to post the address here, consider responding to the donation receipt.

Hello,

I had paid for scp so that it would auto-update the program. but still says my email isn't authorized. Using the windows program (not Windows App), Version 5.17.5 (Build 10414). Not wanting to just put my email here on an open thread necessarily.

Appreciate your help.

Kind Regards,
Stuart