How to make steam install from DVD?

So I finally had time to start playing DS3 today, i insert the DVD, start install, after the redist packages, steam pops up and I enter the activation code. After which, steam happily starts DOWNLOADING game files. WTF is that? Why did I buy the game from DVD then? I also stopped steam, closed it and tried to use ReInstall option in autoplay game launcher, but still same thing.

https://support.steampowered.com/kb_article...=5357-FSQM-0382

Thanks, that worked.