For PC and UbiPlay accounts only: In the Far Cry 5 Overview tab (1st tab), scroll down just a bit and there's a box with all "Owned DLC", the first one should be the "Lost on Mars" DLC. Just left click on the "BLUE" Install tab on the right and the DLC should start loading. You will see it's progression in "Green" on your UbiPlay system tray located at the bottom of your computer screen, where other active tabs are also showing, like file explorer, store, Google and maybe others, depending on your PC set-up and open apps. It should take around 30 minutes to load on most decent PC's. I can't explain it in anymore detail, than I just did. Good luck!.
My download is about 95% complete and I'll know in about a minute or two, if it's working properly, but that's exactly how it worked for the "Hours of Darkness" DLC as well and I had no issues with that DLC.
Update: Game loaded properly and is ready to play. I'm off to Mars. Good luck loading your game!
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