Have at least following versions installed:
- FlightGear 2024.1.1 or newer
Download the zip file.
Use your prefered archive utility to unzip the archive.
Move the unpacked directory to your aircraft directory. This can be FGData/Aircraft, or a custom directory you've specified.
Rename the directory to MD-80.
Make sure that the MD-80 directory does not contain another one (this can happen with WinRAR). If so, move the inner MD-80 directory outside.
To update, delete the MD-80 directory and install the latest version.
Change to the aircraft directory.
Clone the repository with git clone https://github.com/Octal450/MD-80.git
To update just run git pull in the MD-80 directory.