I'll try that stuff shortly. But for completeness' sake, I'll just say what I've been doing here. I recently had a chance to replace key PC parts, so I did a full replacement. What that means here is that 21.1 is essentially a *new* install, with all the parts installed fresh from the Spaceport. The 1.9.8 version is what shows in the Spaceport, so I installed that. No Mechjeb control. A bit if searching showed that the 1.9.8 doesn't work with 21.1, which makes me wonder *why* it's got star billing, and why the more modern version isn't being pointed to, but whatever... I then followed the link to 2.0.9, but as you say, all that has is a few dll's and no modules. I've been trying to get these things to work ever since, and getting more confused all the time. I'll see if these instructions help. Thanks!