Hi Sam,
The answer is yes and no, you can download an installable version of the Google
Earth which includes the plug-in however you can't as far as I'm aware download
the latest version. Goto http://earth.google.com
and click “Download Google Earth”. Untick “Install Chrome” and click “advanced
setup”, select “Previous Version” (7.0) and click “Agree and download” and
select save.
Google Earth is essentially a desktop application hence the plug-in, Google Maps on the other hand is a web based application and does not require the plug-in.
Hope this helps
Regards
John