To install you need to be online!
1. Enter the authorization number.
2. The game is mostly downloaded (but is faster than the patches for PS3).
After you switch your Internet from (eg airplane mode on a new laptop or wireless disable or cable pull).
Then you can play offline, only is Online tries acknowledge the "error message" / notice accordingly.
I only play offline, because the PC TDU player cheat (cheating): Volkswagen Beetle with over 1000 hp!
The PC-XBOX controller is detected, which raises the gameplay considerably!
With Controller You give the right analog shoulder button sensitively gas, to the left you brake too sensitive!
PS: I installed the game on August 14, 2013, my 3 month old Aldi notebook with Windows 8 (i3, 8GB RAM, Nvidia 740M and Windows 8 64bit).
The game runs just as well as on my PS3! So it was also improved, whereby it is stable, but you can not move your trick by fences and walls.
I'm already arrived in Hawaii! So Hawaii goes well (in other review by installation errors is not Hawaii).
The game runs largely smoothly!
Greetings from the Nordheide.