I ran into a problem trying to get the new version of Castle Link (64bit) to work with my old MM ESC. It worked fine with my MMP.
Called Castle and found out the MM used the 32bit system and I had to have a friend load my old 32bit Link disc and load the 1.32 version which disables to USB port and makes the MM work with the 64bit system. Now it connects just like the newer ESC through the MM's servo plug instead of the USB. Works great now!