Downloaded stable build, and displays installer correctly.
But I get a HTTP 500 error when I try to go to step 1.
Any ideas?
Care to give us more details about your installation?
IIS or Apache? etc etc etc
i came across this when reading "http://trac.roundcube.net/wiki/Howto_Install":
Quote500 Internal Server Error::
This is a very common problem. One solution is to either empty out the .htaccess file, or delete it entirely, in the root of the RoundCube installation folder.