Hello
@starshine ! For questions regarding the Project Mercury X addon, I would recommend you to use designated addon thread here:
https://www.orbiter-forum.com/threads/project-mercury-x-for-orbiter-2016.37745/
Then there's a higher probability that I'll see it.
Anyway, it sounds like you installed the 2010 version of the Project Mercury X addon into your Orbiter 2016 folder. Instead, try downloading the 2016 version. Here's a direct link to the zip:
https://cdn.orbithangar.com/user/a9...94-b153-16b81c9ae3e0/ProjectMercuryX-v3.0.zip
If it still doesn't work, please share the contents of your Orbiter.log after running a scenario. Please paste it into
[CODE] text [/CODE] tags