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Ventoy iso bootloader EASY installs from usb for any iso os file
Releases . ventoy/Ventoy . GitHub
Ventoy
All you do is run ventoy to install it to the usb drive as a bootloader.
Then copy as many ISO install files as you want on the usb.
ventoy boots and shows a menu of the iso files, pick one and it will boot the iso and install whatever OS you selected.
I did this after struggling to get a 32 bit windows 7 iso to boot from a usb drive on a particular stubborn intel server board..