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Go to Start -> Settings -> Control Panel -> System -> Advanced -> Environment Variables.Add the installation directory to your path so you may just type "gpg" from a command line rather than "C:\Program Files\GnuPG\gpg":.As of this writing 1.4.2 is the latest version. Download the Windows installer from the GnuPG Download page.Note that if you have a previous installation of GnuPG that was done prior to the new installation, you should follow Enigmail's instructions for removing old GnuPG versions before proceeding. This procedure is based on the documentation for Enigmail. There is now a relatively intelligent installer that will do most of the work for you. The Windows installation has become significantly easier in the recent past. That'll install into /usr/local, you can change that by passing -prefix=/some/path to the configure script. That said, a source installation would look like this:
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For that, suffice to say that some examples include "apt-get install gpg", "yum install gpg", "urpmi gpg", "up2date gpg", or "pkg-get install gpg". I will cover a from-source installation, but I won't cover the package management infrastructures for the various linux/unices.
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Presumably, if you use unix, you already know how to install packages.
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