GOT IT ALL WORKING!
It was a pretty rough ride. Did about 4 - 5 complete installations from scratch with Win7 SP1 and Win10 for comparisons, different PC setup’s, sent two SSD’s to heaven for good and googled countless hours.
So here it is:
Install: Win 7 x64 / SP1
Install: Windows Platform Patch KB2670838
Install patches to resolve open issues of your PC
Install: .NET Framework 4.6.1 (Offline Version)
Install: VC++ 2015 - 2019 Redist Package
Install: DirectX June 2010 SDK
Install: BMS 4.37
Install drivers for your hardware SSC, DEDCapture, …
Thanks a lot guys for all your feed-back and response. Hope this will keep the great Win7 alive.