Hi Joe
You can install the revision cloud tool from SDK folder, see below picture, you will see the tool in Add-ins tab.
Location of the SDK:
Windows XP: <Inventor install folder>\SDK
Windows Vista: C:\Users\Public\Documents\Autodesk\Inventor <version>\SDK
Windows 7: C:\Users\Public\Documents\Autodesk\Inventor <version>\SDK
Jingyi Liu
Inventor Product Manager