.dll goes into the Kerbal/plugins folder. The MechJeb AR202 and Pod folders go into the Gamedata folder. There will already be a 'Squad' folder in there, so just create a new folder there, name it MechJeb2 or somthing and stick the AR202 & Pod folders inside that. It's reccomended you do a fresh install of Kerbal tbh, seems to have a few people out that way. If you cannot see a plugins folder after reinstalling, you need to start up Kerbal just once then close it and it will have appeared. The MechJeb side bar will now only appear if you have a rocket with the AR202 attached to it...this is a 45 pt research item, so a couple of tiers into the research tree. It will only offer Smart-SAS and your data displays...no auto-pilot. I'm assuming the auto-pilot is with the main MechJeb command Pod? or do I have to unlock something else further in the tree? I havent seen where the Pod is located yet. If someone could put up a screenshot highlighting where it's found it would help a lot.