Hello again...
I think I answered my own question. I found this at this site:
https://shared.xara.com/diNpZUgi2O/

"What happens to the Update Service after 365 days?1.Do nothing, the Update Service expires and you will no longer receive any new features. The feature updates you have installed over the past 365 days will continue to run indefinitely, HOWEVER if you re-install your product on a new computer after the Update Service has expired then the new installation will fall back to the version you last purchased"

I would have another question about this: if I would purchase the Update Service another year, and the software would have a major update (ie v17 to v18), would I receive that for free as part of the update service? And if I did get that upgrade, would I be able to keep it if I cancelled the service?
Thanks again for any help,
Joe