Trial version is asking for serial number ... helpp

I selected "try" from the adobe CS5 page and when I am in the install window it asks for serial number.
Why ???
Now there is option to "try as a trial version" however it will not allow me to progress and select this option.
Very Frustrating...


Did you run any other trials already? in any case, try the suggestions listed in the respective section regarding licensing here and also have a look at the specific CS5 stuff.