8.2 cd defect?

Trying to install 8.2 I have been struggling for half a day. Of course safe setting, first trying to update my 8.1 and as that was not functioning a new install. Everytime it stalls at the time when the propositions are made for the software choices. It does not show anything even after a long wait. Trying to update via Yast in the 8.1 install does show the old software and the new software but proposes no new packages to update. So now I am suspecting a small defect on the first cd. Is there a method to check this, e.g checksum or so?