I have the same question as OP.
I am succesfully running Windows 11 Pro ARM as a virtual machine on my Macbook Air M1
But i would also like to run Windows 10 ARM as a virtual machine.
From what i have read, Microsoft isn't further developing Windows 10 ARM anymore,
they have removed the downloadlink.
I googled for a downloadlink but couldn't find a working one.
My guess is that if you would find a working downloadlink, that Windows 10 ARM version would still be too old
and not compatible to run in Parallels Desktop on M1 macs.
Kind Regards.