Per the CometDigital website:

Comet Digital, LLC is pleased to announce that Autodesk, Inc. has acquired the cMuscleSystem plug-in and technology. We feel this transaction is in the best interest of our customers and the long term development of the technology

Existing cMuscleSystem customers with Autodesk Maya Gold Subscription, formerly Platinum Membership, will now be supported by Autodesk Product Support. For product support requests please use the online form, www.cometdigital.com/supportForm.php or login into Autodesk Subscription Center at, pointa.autodesk.com/local/enu/portal/signin.jsp.