How to get Guild Wars 2 to use files on DVDs for initial installation
When I tried to install the game for the first time yesterday, the installer patched itself a little, then didn't even bother looking at the files on the DVDs, it started downloading the whole game. I wanted to play the game last night, and not wait many hours for a 16GB download, so I played and tested some theories, and managed to reduce the download size to only 6-7GB, essentially only the patches from the retail launch.
I blogged a step-by-step guide on how I did it here:
Just thought I could help out anyone that had the same problem as me.