GTN750 in P3D

[Laurin]

Unfortunately there is no way for both PC Trainers to reside at the same time.

It's actually possible to have them both installed and switch between which is active.
That's how I did it:

• If at any point a trainer asks to update or enable automatic updates, decline
  
• Start with all trainers uninstalled and to be safe delete %localappdata%\Garmin
  
• Install Trainer 2.7.1.0 with BOTH installation paths in the same root and subdirectory (replace [root] with the path you chose for all instructions), like:
  [root]\active\Trainers
  [root]\active\ProgramData\Trainers
  
• Only install the modules you need for 2.7.1.0 (eg GTN module but not GTNXi module)
  
• Copy the complete content of [root]\active into a new directory [root]\v2
  
• Uninstall the 2.7.1.0 Trainer. Also delete [root]\active to remove any missed files. Might need to again delete %localappdata%\Garmin (I wasn't getting the latest GTNXi module later if I didn't do that)
  
• Install Trainer 3.0.1.0 with both installation paths EXACTLY THE SAME as you chose for 2.7.1.0, like again:
  [root]\active\Trainers
  [root]\active\ProgramData\Trainers
  
• Again only install the modules you need from this trainer
  
• Rename [root]\active to [root]\v3
  
• In [root] create 2 batch files.
  
  1. v2.bat:
     @echo off
     
     if exist [root]\active\ (
       rd [root]\active
     )
     mklink /J [root]\active [root]\v2
     
  2. v3.bat:
     @echo off
     
     if exist [root]\active\ (
       rd [root]\active
     )
     mklink /J [root]\active [root]\v3
     
• You can now switch the active trainer version with the bat files.