Mt. Mograph - Motion Studio v1.2.2.5172 (Extension)

Mt. Mograph at some point switched to a subscription model, justifying it with an external "manager" app that is essentially 90% DRM and 10% meaningful features.

This does not include the full Motion Studio app but instead the actual AE extension you're used to using in AE (aka the part that matters). This is what you would recognize if you've used or even purchased their past versions of the Motion 2 or Motion 4 extensions.

Install like you would any other AE ZXP file (aescripts ZXP/UXP etc...)