In order to play this with a friend you gotta change some of your windows configuration. This basically simulates a Lan multiplayer mode while you are actually distant with your friend. So here is step by step (up to 10 minutes) on how getting it to work:

1. Install Hamachi https://www.vpn.net/
1.1 Create new network using hamachi, and give the name and password to your friend;
2. Press the windows button, type "ncpa.cpl" at the search and press enter;
2.1 Right click the Hamachi and go to Properties.
2.2 On the list, search for "Internet Protocol Version 6 (TCP/IPv6)" and UNCHECK that box;
2.3 Double Click iPv4. Click advanced. Scroll down and uncheck the box interface metric n type number 10. Then click ''OK'' 3 times;
3. Press the Windows Button once again and type "firewall", then disable the firewall for private network, public and domain.

4. Launch the game, select LAN mode and have fun!


Both friends need to do all of the steps above. You both must play the Prologue (tutorial) in order to unlock the coop menu.