"Don't offer to rename my payees again"

I don't use renaming rules, and Quicken doesn't ask me if I want it to rename or to create a renaming rule.

I control this using Online > Renaming Rules. There are a couple of options at the bottom of the Renaming Rules dialog: one telling Quicken not to "use" renaming rules when processing downloaded transactions; the other telling Quicken not to "create" renaming rules when processing downloaded transactions.

I think you want both of those options to be "Off". If the "do not use renaming rules" option is "Off", the "do not create renaming rules" option is inaccessible ... and it may be "On". If so, you can temporarily turn on the "use renaming rules" option, turn off the "create renaming rules", then turn off the "use renaming rules".

By the way, I'm not sure why you would hesitate to do this: what problem is a renamed payee in one transaction going to cause.

It's a trivial matter to un-rename a payee ... in fact, Quicken offers an option to do just that: right-click on a transaction whose payee has been renamed, and Quicken will give you the option to "Revert to " the original downloaded payee name (even displaying the original name).