Installation from Source
~~~~~~~~~~~~~~~~~~~~~~~~
I got the source installation.
I then did the cabal thing

  runghc Setup.lhs configure
  runghc Setup.lhs build
  runghc Setup.lhs install

I needed perl for this.
Once perl was installed I made the mistake to only run runghc Setup.lhs build
which gave the errormessage "perl not found".
Once I started with runghc Setup.lhs configure it worked. 

I think I needed to add the path to where alex
was installed to the windows path.
This path was
C:\Program Files\Hakell\bin\

(Path, is set via 
Startmenu->settings->system -> advanced -> environment-variables.
The path works only if the path has \ (and not /).