These instructions were mainly written for linux: https://www.geany.org/support/verify-gpg-signature/ (well, at least 'gpg' is not present on windows cmd by default). I've never used gpg before on Windows, after some research I found this https://gnupg.org/index.html So I suggest adding in the instructions this link, and also https://gnupg.org/download/index.html and https://gnupg.org/download/integrity_check.html , to help future Windows users :)