Please confirm that you have followed the download tutorial and completed the file download.
Open “File Explorer” and locate the downloaded file.
Double-click to open the zip archive (WinRAR or 7-zip are recommended; other archive management programs can also be used if they are working correctly).
Select the first-level folder after opening the archive.
Click “Extract,” and extract to the folder “Aerofly FS 4 Flight Simulator\aircraft\XXXX” (“XXXX” represents the folder name of the aircraft model matching the downloaded livery, for example: to download “A320 China Eastern Airlines 2010 World Expo Livery,” you need to open the “a320” folder).
Installation tutorial complete. Open the game to confirm that the plugin is installed successfully. If the installed plugin does not appear in the game, please check the installation steps, adjust them, or download or install it again.
***This tutorial is based on resources from this site; downloading or installing resources from other sites may not be applicable. **