I believe that the set of HollywoodFX transitions included in Studio 19 Plus and Ultimate versions does include all of those that were in Studio 9 Plus + a fair few more. And the "HFX Creator" tool is also fully "unlocked" - equivalent of the "HFX Mega" level in Studio 9.
As recent versions of Studio can't import the .stu files belonging to Studio 9, one "manual method" of migrating those projects would be to open them in Studio 9 and take screen shots of the timeline + copy/paste the contents of the timeline "text view" into a text file. Then use those screen shots + clip length information etc. in the text file to help you build a new "lookalike" project in Studio 19.
Regards,
Richard