sfs had an update on installing mods, go place your mods into C:\Program Files (x86)\Steam\steamapps\common\Spaceflight Simulator\Spaceflight Simulator Game\Mods (if your installing parts then add \Custom Assets\Parts) assuming you have the modloader.
This Spaceflight Simulator Custom Part Pack comes with some "nice to have" utilities that expand the experiance but don't break game mechanics or provide signficant advantages.
Current Items:
Truss Separators, now you can see what is between your stages
Cargobay, for when you want to launch a shuttle worth of payload.
45 Degree struts and connector for more elaborate super structures
PicoSat, a cube sat
Hidden Separators for streamlining rocket.
Vent port for venting fuel needlessly into space
Petal Fairings
MegaCHUTE Deorbiter - a giant high altitude parachute
Vertical Landing Gear (3 Sizes!)
Engine Breakaway system
Solar Radiators for reducing heat and generating electricity
Tri-chute - Three chute in one.
Future Planned Items
Hinged Fairlings, because they look cool.
Flag, make your mark on alien soil.
Pocket Landing Gears, for when you want to be fancy!
I have and it fixed the issue. Idk why truss separators, PicoSats, and even tri-chutes along with many others needed the mod bc half of the parts with the issue had nearly nothing to do with electricity.