Which new (incremental) version of RW7 should I Install?

I’m upgrading my Mac (from Mavericks 10.9.5) and plan to install one of the versions of v 7. Last week, I updated v 6.2 to v 6.4 and nothing worked, wouldn’t open, etc.

I have projects made with v 6.2 and will reinstall 6.2 along with v7 so I can have them both on the new Mac.

Since it’s hard to keep up with which updates are good and which updates cause problems, can anyone suggest which (incremental) version of RW 7 I should install on my new Mac?