Be extra kind and leave him a nice review, that helps others a lot too.

Glad to hear you got it working.
The good news; PT 2021 should still feel pretty comfortable to use.
Caveat; you will need to get used to a new menu system and right-click options, but that is a minor tradeoff for the new features you will enjoy.
Going from 2010 to 2021 will be quite a change.
Examine the new menus, everything is still there, but it may have moved.
If in doubt, right click on a track and explore the options there.
That would be the best advise I can think of for such a big upgrade.