ConwayMikee

I recently got a new PC and finally got around to installing KSP 1.2.1, however it doesn't seem that any versions of MechJeb currently work on the new version. Is there a version of MechJeb that is supported by 1.2.1 or something relatively similar to it that I can install? I don't typically use it, but it is helpful when I want to demonstrate circularization and load distribution to my little brother so I can explain the math and maneuvers without having to focus on flight.