Rebuilding older system: Which EuControl version?

[m.palius]

Haven't used MC/PT in donkey years until recently.
Artist Transport slows input response time (including keyboard & mouse) to unusable. Non-problem last time used. Turning Transport off resolves lag but makes Transport unusable. Thought I'd try updating EuControl software. Question is: which version is compatible? Can't find data for PT pre-12.8. Can't find answer in knowledgebase or google.

PT 12.4.0.294 co-installed w/
MC 19.120.53599 w/symphony
Avid Artist EuControl 3.5.0 11754885
Win 7

Then recommended HP Z400
Nvidia Quadro K4200 driver 441.66
Artist Transport
Black Magic Designs Decklink Studio 4K
MBox 3 Pro package 1.1.10, firmware 1.0.4

All versions of BMD Desktop Video cause MC to crash to desktop from launch splash screen at installing audio devices. That's another problem for another thread in another forum.

Thanks in advance for answer or pointer thereto,
/mp