6.8.0 RC5 Windows 10 VM boot loop

Why do you suppose this is specifically an -rc5 issue? If you messed up and want help a better place would be in the general help forum.

Quote

 cannot manually boot my downloaded Windows 10 ISO file to make a fresh install.

If you edit the VM and switch to xml view, you can change the boot order

    <disk type='file' device='disk'>
      <driver name='qemu' type='raw' cache='writeback'/>
      <source file='/mnt/user/domains/Windows 10/vdisk1.img'/>
      <target dev='hdc' bus='virtio'/>
      <boot order='1'/>
      <address type='pci' domain='0x0000' bus='0x03' slot='0x00' function='0x0'/>
    </disk>
    <disk type='file' device='cdrom'>
      <driver name='qemu' type='raw'/>
      <source file='/mnt/user/isos/Win10_1903_V1_Norwegian_x64.iso'/>
      <target dev='hda' bus='sata'/>
      <readonly/>
      <boot order='2'/>
      <address type='drive' controller='0' bus='0' target='0' unit='0'/>
    </disk>
    <disk type='file' device='cdrom'>
      <driver name='qemu' type='raw'/>
      <source file='/mnt/user/isos/virtio-win-0.1.160-1.iso'/>
      <target dev='hdb' bus='sata'/>
      <readonly/>
      <address type='drive' controller='0' bus='0' target='0' unit='1'/>
    </disk>

Change the boot order for the cdrom to be 1, and the vdisk to be 2

 

But, as to the boot loop, try only setting the VM to use a single core and see if that makes a difference temporarily

Edited November 5, 2019 by Squid