Okay, now I've created a .zxp package with what I thought would be the correct manifest.mxi. But if I try to install the package via the Extension Manager CC, the Manager doesn't seem to recognize the currently installed Premiere Pro CC and Premiere Pro CC 2014 as part of the Premiere family and refuses to install the package.
In the .mxi I defined:
<products>
<product familyname="Premiere"
primary="true"
required="true"
version=""
maxversion=""/>
</products>
But the Extension Manager refuses installation with "Premiere required."
If I do not define a product the Manager tries to install the package, but then stops because of the unknown token $installfolder in the destination definition of my file:
<file source="win64/"
destination="$installfolder/Plug-ins/Common/MyPluginFolder"
file-type="ordinary"
products="Premiere"
platform="win"/>