You might get away with activating 7 ult with windows loader, and then using any old Ultimate/Pro key for PID.txt (Just to force the Pro install), when it fails to activate 10 pro, remove the key and try activating again, because 10 pro will know your Win 7 Ult was genuine before the upgrade, and shouldn't require a key to activate
You can force Windows 10 pro to install with an "ei.cfg" file with the info shown below. It would be easy to upgrade home to pro, providing you have to a pro key. [EditionID] Professional [Channel] Retail
Even without secure boot Win7 won't install on UEFI-only PCs (no Legacy support). Win7 just ain't meant for it.
Luckily I haven't had to try, the machines I get in to fix these days, the owners all want Win 10 on them now Saves me messing about trying to get WU for Win 7 working
WU for Win7 works fine here. I have my own Win7EntDec2015.iso (has all updates till Dec2015 integrated) made. Also, I've come across PCs that just don't have driver support for Win10 for one or more components (tried DriverPacks) then the only option left is to downgrade. Hope you don't run into them.
I'm quite good at finding drivers / installing hardware that's not supported, compatibility mode etc Haven't run into a machine I couldn't get working with the OS requested yet apart from an absolutely ancient laptop that the guy wanted 7 on, but display driver refused to install no matter what, so I had to go with XP But that was a really really old thing he got from ebay for £5 lol
My ancient tablet from 2003 has XP only drivers, so it behaves poorly on Win7. But given the basic drivers of win 8-10 isn't so basic anymore it runs way better on Win8/8.1 than in XP. (I can't test it with W10 because the CPU checks, but I'm sure that w/o them it would run W10 as good as w8.1). Unlike on w7 the standard ms adapter driver has some video and 3D xleration, the result is that some games (obviously not recent games) runs better on w8.x using the basic ms drivers than in XP with the proper Nvidia drivers. The same is even more evident on video section.
That was my point. Many old VGA card will work reasonably well w/o having to search for an (non existent) driver. Obviously the mileage may vary depending the VGA taken in account. But surely they will work better than 7 w/o the proper driver and even w7 with some proper drivers written for XP.
How does Win 10 setup accepts Win 7/8.x MAK key during install? Just deducts it from remaining allowance? Need to test it...