http://avid.force.com/pkb/articles/c...m-Requirements
even 10,13,4 not supported, and I don't see any possible way to get an earlier version of High Sierra anyway
WOW avid are officially acknowledging "serious" low buffer cpu issues with HS 10.13.4 which would mean 10.13.5 and .6 are probably the same.
DARN.
This truly sucks. I hope they fix it! I won't have a choice if I get an imac pro! Damn it! Or even the new hexacore macbook pro! Will come with 10.13.6!