When upgrading to a new version of PGP Command Line, in most cases you can install the new version without uninstalling the older version of PGP Command Line. During installation, the new version of PGP Command Line will overwrite or update any older version files. See the installation steps in the following articles for more information on installation requirements.
For more information on installing PGP Command Line, see the following links for articles for your operating system:
Installing on AIX
Installing on HP-UX
Installing on Max OS X
Installing on Red Hat Enterprise Linux or Fedora Core
Installing on Solaris
Installing on Windows