Yes, it is available as a stand-alone full installer for SB Pro PE v 4.397 (installs SB only), and as a Bundle Installer which, additionally to installing v4.397 would also automatically update other components of the package, if required. There no 'patch' installer.
And you don't need to reinstall maps delivered with Maps Installer.
P.S.
I'd recommend to use Bundle Installer, since it downloads and updates only what needs to be updated.