hehe, i never ran any dodgy betas which have been kicking around the nethernet for the last few months, but i had problems installing it too....
a quick trip to <a href="
http://webforums.macromedia.com/preview_dreamweaver_mx/" target="_blank">the appropriate pre-release forums</a> solved my problem - i just did a bit of digging and ended up installing it in 9 then booting back into X. Hopefully the answer you need'll be there for ya ...
Anyhoo, I'm glad I never installed the leaked betas ... this prerelease installer is about 40% larger, and i'm guessing its either more tutorials or better and more extended code ...
Well, I hope so ...

oh and the 12k+ files: I saw that too, but the previous DW/ultradev did similar and i think its cos the whole interface is XML driven and the whole app is quite modular. so hopefully all we are seeing here is all the stuff a single app normal installs as the main prog ....
Anyway, I ramble ... time to go play with this beta and see if it'll be worth my money
