There was a custom installer that a company called [url removed, login to view] developed and it was an .EXE file. Once you downloaded this program, it could then installed the PageRage browser plugins/Add-on on IE, Chrome, and FIrefox.
1. User downloads .exe file
2. User downloads and opens file
3. User then downloads our browser plugins and each of their web browsers are updated with the file. Eg Chrome would have the .crx file automatically added.
Is this something you can do?