I have a laptop running windows 7 and dual booting to some other operating systems as well (linux and windows 10 TP) with the windows 7 bootloader on the MBR, which points to a grub bootloader as well for linux systems.
My question is this: I really like windows 7, but I would like to upgrade to windows 10. I want to keep windows 7 for compatibility and familiarity, but add a windows 10 installation in my dual booting setup. The problem is that it needs to be an upgrade so the install is free, but I want to keep my windows 7 installation.
How can I achive this? Could I do something like cloning the windows 7 partition and then upgrading one of the clones to windows 10?