So this was really annoying me because nobody on this entire forum had a solution that worked. What worked for me was going to https://www.mastercam.com/support/technical-support/drivers-and-utilities/ and downloading the CodeMeter 7.60d Runtime Installation file and running that and making sure that when installing it you choose all of the features in the icon tree in my attached file. Doing so and letting the codemeter program finish installing and then running MasterCam, should get rid of the error 101 when trying to activate your license. I don't know why this works, but it does. When you download MasterCam, it already installs a version of codemeter for you but for some reason that version does not work. This version 7.60d does work.