@Poodmund is taking over development and maintenance of OPM. Please see his link in the last comment of the thread for the download.
The new thread for Outer Planets Mod can be found by following this link: https://forum.kerbalspaceprogram.com/index.php?/topic/184789-17-outer-planets-mod-v224-27th-may-2019/
@Galileo I added it and started a new career.
There is an issue with CustomBarnKit somehow - I also use the following mods which have own CustomBarnKit patches:
JX2Antenna
SETI-CustomBarnKit-Config (the nearly whole SETI / UbM and the UbM Extended configs)
Strategia
and also Antenna Helper - but this is set to CommNet.
In SPC a right click on Tracking Station shows this:
and this is written to the log then:
ArgumentException: Couldn't find custom param