Windows 10: 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

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Dual Boot Change from Windows 8.1 & 7 to Windows 10 & 7

I have a dual boot Windows 8.1 and Windows 7.

(1) Is it possible to have a triple boot Windows 10, Windows 8.1 and Windows 7?

(2) If not, can I just upgrade the Windows 8.1 to Windows 10 to have a dual boot Windows 10 and Windows 7? Or do I have to do the normal dual boot set-up?

 

Dual boot system consisting of Windows 7 & Windows 10

Is it possible / permissible to alter an existing dual boot system of 2 windows 7 O.S. to upgrade one of the windows 7 to Windows 10 and leave the other Windows 7 as is? The result would be a dual boot system of Windows 7 & 10.

 

The only way to obtain an activated Win10 Upgrade is to run it from inside the Windows version you want to upgrade. If you boot from a DVD or USB and run it that way, it will never activate.

Also, the upgrade WILL change the OS selection menu -- I don't believe there is any way around that.

 

Thanks for the reply. sorry for the confusion on OS selection menu. I do want it to update the menu at startup to Windows 10 and Windows 7. My real concern is that upgrading to 10 from within Windows 8.1 will make the boot menu disappear and not allow Boot into 7. Sounds like your saying that if I upgrade to Windows 10 from within Windows 8.1, I will upgrade only the 8.1 and still be able to boot into windows 7 at startup via the os selection menu at startup. This is what I need to do. Is that correct? Thanks

 

If you are dual-booting, be sure to turn off fast boot in Win 10 (it's on by default). Otherwise Win 10 will hibernate when shut down, and if you then boot to Win 7 next power on, the file systems will be corrupted.