Studio 8

So the new Macromedia Studio 8 was released yesterday and this evening I have it in my hands to install... yet it won't install on my main PC! The installation tells me the InstallScript Engine isn't avaliable. Though I managed to track down the free installation package for this, it still won't install. Oddly it works on my laptop just fine. I guess for now I'll have to make do with that until Macromedia support helps me...