I've done a bit of searching re. installing Windows 7 on the new Mac Pro Cylinder and it seems everyone's having issues getting Windows 8 or 8.1 installed... I don't see any mention of Windows 7. I tried installing Windows 7 64-bit thru Bootcamp but got the warning about Windows 7 not being supported. I tried skipping Bootcamp and partitioning the HDD manually, then held ALT at restart to boot into both a Windows 7 USB drive and a Windows 7 disc on two separate attempts and in neither case did the Windows install come up as an option. I even tried putting my current Winclone image from another 2013 machine onto the Bootcamp partition, but again no go, didn't show up in the boot table when holding ALT on restart. Apologies if I'm missing something, but is it actually the case that Windows 7 absolutely can't be run on the Mac Pro Cylinder? It runs fine on my late 2013 laptop with fusion drive. Thanks for any help!