Where to find Qubes Master Key? (using windows)

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I corrected the typo and got:

gpg -v --verify Qubes-R4.0.4-x86_64.iso.asc Qubes-R4.0.4-x86_64.iso
gpg: can’t open ‘Qubes-R4.0.4-x86_64.iso.asc’: No such file or directory
gpg: verify signatures failed: No such file or directory