Group Calendar Plugin Compatible w/ BuddyPress Version 1.2.3

I'm trying to install the Group Calendar Plugin. I've followed the install directions but the plugin is not appearing in my plugin list to activate sitewide.

We're running the following:
BuddyPress Scholar Child 1.0.6
BuddyPress Version 1.2.3
WPMU 2.9.2

Is there a compatibility issue?