OpenSUSE 10.2 Alpha4

Could someone please provide the answer to this question: if I was to download the ISOs for Alpah4 would I expect to have this alpha progressively upgraded in the same way as an official release to ultimately become Alpha 5 or Beta1 and so on until it becomes the official release 10.2? Or would I have to download a complete alpha5 ISOs or beta1 et alia if I wanted to keep up with the progress in 10.2? Cheers. -- This computer is environment-friendly and is running on OpenSuSE 10.1