One of the things we did for the 1.2.2 release of PowervRA was to test all of the functions against a vRA 6.2.4 deployment. Now that we have created Pester tests for all of the functions, it is quite straightforward for us to test against different vRA versions.
While we had initially targeted vRA 7+ because of the better API support, we know that currently the majority of installations out there are 6.x.x. So we are happy to confirm that 58 of the functions work fine with 6.2.4, which was a slightly higher figure than I was expecting.
All of the functions which will not work pre v7 have been updated to include an API version check and will exit the function with a message to reflect that if you try to use them with 6.x.x, e.g.
Get-vRAContentPackage is not supported with vRA API version 6.2