Thank you for the reply.
As my father-in-law's MacBook (10.6.8) with FaceTime 1.0.4 is not at hand now, I can not check it for myself right away.
But my understanding is :
(1) FaceTime 1.0.5 update is free for download for the OSX 10.6 users who have already purchased and installed FaceTime 1.0.4 or earlier.
(2) The OSX 10.6 users who want to start using FaceTime from now, need to purchase the 1.0.5 for $0.99 (just as other OSX 10.6 users did before).
The latter (2) is because OSX 10.6 does not include FaceTime which was not ready at the time of its release. Due to some accounting regulation, Apple chose to sell the FaceTime to OSX 10.6 users at the mimimum price rather than to add the function afterward for free.
That means every OSX 10.6 user who wants to use FaceTime has to pay $0.99 at some point of time, but I believe Apple is not so greedy to charge the same software twice to fix its bug.
I guess the screen shot you posted might be taken either by a non-OSX 10.6 Mac, or by OSX 10.6 Mac without FaceTime installed. If you see the same page by a OSX 10.6 Mac with FaceTime alreay installed, it will look diffrently.
Anyway, I may be wrong, but I will check it with my father-in-laws' MacBook hopefully this afternoon.