downloaded all sha512sum fles from here
gpg --verify xxx.sig Whonix-XFCE-16.0.3.7.Intel_AMD64.qcow2.libvirt.xz
output= no openpgp data found
gpg --verify Whonix-XFCE-16.0.3.7.sha512sums.asc Whonix-XFCE-16.0.3.7.sha512sums
output = correct signature
how to use sha512sums.sig ?