Ok, so I re-installed hitfilm on my new machine, but apparently I got the wrong type of HF Pro?!
Is it possible to have the features that match my 2019 version unlocked on whatever this new format is please?
If you have an old license, you will need to install that version of the software you licensed. The account page on the website should hopefully show/list you the version you have available to you.
All the old Hitfilm versions are available here.