I checked and double-checked that link and it's absolutely the correct one for what I do. As I said, there's a bit of pop up's to deal with and they are a little tricky(once you learn it, it's super simple after that, and it's well worth it, any movie you want for free, even brand new ones). I went through the same steps that you did and Deadwood played just fine I had it going within less than 10 seconds.
Trust me, you do not have to sign up or make an account, you do not have to give them an email, credit card or anything whatsoever.
After this step....#3. "I click on the movie and it says I must be logged in to stream or download."
DON'T SIGN UP, don't do anything but close that tab (that is a new pop up tab(tricky)) ... The previous tab that you clicked from should now have some boxes/adds to close(1 to 3 of them). Close them out(sometimes more than one click), if at any time a new pop up/tab should open just close it and continue on at the previous tab. Once the boxes/adds are Xed out you can hit the play button and movie will start. If you pause/expand or click the movie screen you might get a new pop up tab...just x it out and then resume your action... pause/expand/play or whatever.if at any time another AD should appear just X out. It will not let you hit play unless all ads have been cleared from over top of the play screen. Clicking anywhere on the screen other than the X's will open a new tab. If that should happen just close that Tab out and resume what you were doing. I know it sounds complicated and lots of Hoops, but trust me it's not what's your kind of understand what's going on.