You'll need the Freelancer Mod Manager found here: https://download.wcnews.com/files/mods/flmminstaller1.31.exe
and the mod itself can be found here: https://download.wcnews.com/files/mods/Privateer2Ever.flmod
Create a clean install of Freelancer. Do NOT install the 1.1 patch; this is provided with the mod and installing it may lead to undesirable effects.
Download and install version 1,31 of the Freelancer Mod Manager. Do NOT download newer versions; they are known to be buggy and may corrupt your install.
Double-clicking on the mod file will then automatically install it. To play, launch Freelancer Mod Manager and activate the mod, then launch the game.
If the game crashes on launch, go into the Tools menu and delete the autosave.
64-bit Windows editions have a known bug where rundll32.exe will continue to run after the game is closed. This will lead to errors during mod deactivation. At worst, this will leave mod files in your game folder. This may not have adverse effects - but then again, it might. To be safe, it is recommended to either back up your original installation or run the game from a seperate install.