Kerbal Reusability Expansion and MechJeb not working with 1.6.1

[Aflacfire1]

I recently downloaded the most recent version of KSP, version 1.7. Once I started playing I realized that a lot of the mods I was using with 1.6.1 were not going to work with 1.7 and I had quite a few really nice ships. I therefore went back to 1.6.1 and reinstalled all of the mods that I had been using before but neither MechJeb nor Kerbal Reusability Expansions are working now. I'm fairly new to modding games on MacOs so if there is someone that could help me out and walk me through the process I would greatly appreciate the help.

[Gargamel]

These threads might help you out:

[Tutorial] How to install mods (manually & CKAN) - Tutorials - Kerbal Space Program Forums

How to get old versions of Mods - Add-on Discussions - Kerbal Space Program Forums

 

[Aflacfire1]

Hey Gargamel, I've followed the instructions on manually installing mods and neither MechJeb nor Kerbal Reusability Expansion are working. When I start the game I get a message saying that MechJeb is installed incorrectly and gives me the order in which it should appear. I checked my files and it appears that everything is in its correct spot. I don't know if it matters but I am using MacOS. Can you please explain things further?