Mo786 wrote:
Is there a way to get the Installer to install in another location
The offline installer (http://get.adobe.com/reader/enterprise/) will allow installing to a different than the standard location, but that still will not allow to have multiple versions installed.
You can, of course, keep an older version of AcroRd32.exe somewhere, but it would have to be invoked manually, not through a function call or file association.