Macbook Pro 2015 - Install Windows 7 then upgrade to Windows 10 (Boot Camp) I have a 2015 Macbook Pro and an OEM license of windows 7.

I plan to install Windows 7 with these instructions provided by Kevin in this thread:
Install Windows 7 On MacBook (x) 2015

This will hopefully let me boot camp into Windows 7 with some limited functionality.

My question is, since Microsoft is giving free upgrades to Windows 10, can I upgrade my windows 7 license to windows 10 through boot camp utility? Since my Windows 7 installation didn't use boot camp utility, will there be compatibility issues from upgrading from windows 7 to windows 10?

Also, has anyone with a virtual machine been able to claim their free upgrade to windows 10? Not clear to me if you are ineligible for upgrade if you have an OEM windows.
Bit late to the party! However, this is essential for anyone else in the same boat -

If you install Windows 10 directly and update to version 1511, it'll accept Win7/8/8.1 product keys when you activate.