3dsmaxplus 2015 and launching in shell and shotgun

I can't seem to get tk-3dsmaxplus to work with tk-multi-launchapp. I want to add and test Shotgun w/ 3dsmax 2015, which requires tk-3dsmaxplus.

However, when I try to launch tk-3dsmaxplus through tk-multi-launchapp:

ERROR: Path to 3dsmaxplus engine (tk-3dsmaxplus) could not be found.

I didn't use tank to add it to shotgun_project.yml or project.yml because I did not see a way to add it. See my attached files for code

Thanks,

Anthony Sucdese