When you get the error "missing extensions", it's usually not that the
extension is missing, it's that it's disabled from the Apple Extensions
manager. The following extensions must be enabled:

Interlok Engine
USB iLok driver
CarbonLib
Open Transport
Internet Config Extension*
URL Access
QuickTime

Note that the libraries associated with Open Transport and
Quicktime are spread across several extensions. We recommend
that you enable all of the related extensions that have OT,
Open Transport, or Quicktime in the name.

* The Internet Config Extension may not be visible from
Extensions Manager, it simply needs to be present in the
Extensions Folder.

Once they are enabled, reboot and should now work. If you're still
having problems, please check the versions of these extensions:

Interlok Engine
USB iLok driver

If they're older than v4.1.5, please download and install these updated
extensions: www.paceap.com