Hello Richard,

The only way is to use version 9.2.2 of V4RB and Valentina Studio specifically for this application:
http://valentina-db.com/download/prev_releases/9.2.2/mac_32/v4rb_9_mac_ub.dmg
http://valentina-db.com/download/prev_releases/9.2.2/mac_64/vstudio_x64_9_mac.dmg

So using Mac Xojo 2019 r3.1 how do I use 2 separate versions at same time?

Richard,

I think Xojo team should convert to 64 bit that cloud.
Please ask them.

The different versions can be used but not at the same time.

You can have two separate Xojo folders and install different versions of the plugin into them.
But both plugins use /usr/local/lib/vcomponents_x64 folder, so it is necessary to install one version and rename this folder, like
/usr/local/lib/vcomponents_x64_9

And install another version and rename it
/usr/local/lib/vcomponents_x64_10

Now before starting Xojo with necessary version rename the appropriate folder to /usr/local/lib/vcomponents_x64

Quite complicated, it may be simplified with a bash script.
Yes, ideally would be for Xojo Cloud to implement 64-bit support.