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Windows 10 upgrade on existing Windows 8.1 and Windows 7 Dual Boot
I currently have a system running legitimate copies of windows 7 &8.1 on separate partitions on the same drive. Not using any special boot loader, just dual boot menu in windows. Would like to know the best way to upgrade the windows 8.1 while keeping the windows 7 install and not changing mbr or menu at startup other than to change 8.1 to 10. Seen many tutorials on adding to a single boot to make dual, but not much on existing dual boot systems. Should I download the iso or run from invitation in Windows 8.1? Thanks for any help