Well after 3 days lost and a lot of temper tantrums I'm back to Zorin 16. Seems 17 doesn't like me or my ancient laptop but is quite happy on my desktop. I think it's compatability issue with the HP9630p. I tried Ventoy, Clonezilla and Rufus to no avail. Always the dreaded black screen after complete installation. Alas , life is hard.
Your thread states update. Did you try 17 in 'Try Zorin' mode instead of attempting an update via the Updater?
So, You didn't used the Zorin OS Upgrader and instead You wanted to make a fresh Installation?