I had Maya 2014 installed on my machine as a trial. Once I received my license, I registered and wanted to start working with the extension package (XGen, etc.). I went to the subscription site and downloaded the two files for windows and tried installing as suggested. After installation, I opened Maya and the extension package was not there.
I searched around on the forums and found out that someone got it to work by uninstalling Maya 2014 and reinstall using the extension package. This I did, but the XGen is still not showing up --- what do I need to be doing for this to work!