> verify their install script with GPG (although note that on top of the steps they run, you should ideally also verify the script against a known hash that you

> verify their install script with GPG (although note that on top of the steps they run, you should ideally also verify the script against a known hash that you verified elsewhere to make sure that the contents of the script is what you expect, as well as the authors). If you've verified the script with GPG, the extra step of a hash is wholly unnecessary. Any change to the script's contents would immediately invalidate the GPG signature.