I have (iMac 21.5-inch, late 2012) with windows 7 installed using boot camp assistant.
and when I decided to upgrade the OS to Sierra it shows a message that I need to change the partition scheme to GUID... so I found it a chance to formate my hard disk and make a fresh install for my mac os and windows 7.
After formatting the hard disk and re-partition it (GUID scheme), and after installing Sierra I had a boot camp Issue:
I am trying to install windows 7 or windows 10 using boot camp assistant .
install or remove windows 7 or later version "greyed out"
How can I fix this? and I don't wont to use VMware.
1-) I have Win7 64-bit Iso and Win10 64-bit Iso.
2-) I installed all updates.
3-) I downloaded latest windows support software.
Please someone help me am dying
and when I decided to upgrade the OS to Sierra it shows a message that I need to change the partition scheme to GUID... so I found it a chance to formate my hard disk and make a fresh install for my mac os and windows 7.

After formatting the hard disk and re-partition it (GUID scheme), and after installing Sierra I had a boot camp Issue:
I am trying to install windows 7 or windows 10 using boot camp assistant .
install or remove windows 7 or later version "greyed out"

How can I fix this? and I don't wont to use VMware.
1-) I have Win7 64-bit Iso and Win10 64-bit Iso.
2-) I installed all updates.
3-) I downloaded latest windows support software.
Please someone help me am dying