I suggest:
https://ventoy.net/en/index.html
(one of the advantage of Ventoy, is that in lower left, it shows if it booted
in Clasic mode, or in UEFI mode)
Use it to make your USB key "Ventoy"
Try it by copying
http://www.tinycorelinux.net/15.x/x86/release/TinyCore-current.iso (only 23 Mb)
onto it.
Now I suggest you stop trying to install with the USB image, and rather copy
the iso image inside of:
https://www.ibiblio.org/pub/micro/pc-stuff/freedos/files/distributions/1.3/official/FD13-LiveCD.zip
Copy the iso file also on the Ventoyify USB key.
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