Maybe you could share what other extensions are installed on your copy of DW and/or how you managed to get it to work right.
In my case PowerCMS Builder just doesn't do anything. No error, no asking info, no activation. Nothing. I have SuperSuite and installed virtually every extensions they offer. All of them have always worked nicely without any problems, but this one has been one major headache to me. Because I have so many of them installed, maybe there is some kind of conflict with other extensions. For instance, I have Site Sculptor installed, and maybe, just maybe, this new extension is messing with Site Sculptor's PowerCMS-based shared resources, or something along that line. Obviously a lot of the users are getting it to do something, so there must be something unique about my situation (or anyone's situation for that matter).
There has been a new development. The thing started working. I took a chance, reinstalled the beta version, deleted .dat as usual, tried a slightly different site setting for test site and viola, it launched this time. Will have to try and see if I can make a web site now.