I think I might have misunderstood how the One-Time payment works.
I paid when Hopkinton was the latest version. Is that it? Do I not have updates good till the end of a one-year period?
I ask because there is no sign of Ipswitch in my account. Come to think of it, Hopkinton is not mentioned by name, either. All I see is the downloads available, they are identified by type and function, but not by update name.
Note: I do not used CCC due to unreliable, slow internet connections here, so I am looking in my account.

The one time payment includes a year of updates. If you are looking in https://www.cakewalk.com/My-Account/Products click on the SONAR Artist/Professional/Platinum item to generate the download file. It should show the Ipswitch files.

You get updates for a year. Make sure you download the latest CCC!!

Oh, you replied too quickly, I wanted to delete the post as soon as I noticed the box on the right, and there it is:
IPSWITCH!
OK, I do have it.