why cant i preload portal 2?

Answer 1

try this link with steam running - http://steam://install/620

Answer 2

If you are talking about steam

while first most game say you can preload this game so when it comes you its ready to play( so they can use it as a sell point)

and sorry to say portal 2 did not say that in its promotion only thing it said was get a free copy of portal or give it to a friend