Hi,
I just installed RC 1.0.4 on CentOS server.
PHP version is 5.3.3 (fastcgi).

I completed installer successfully.
When I try to open http://domain..../webmail I get blank page.

Access Log reports internal server error:

"GET /extracms/webmail/ HTTP/1.1" 500 -


And this is error log:

[Wed Dec 24 09:46:37 2014] [error] [client ] FastCGI: server "/usr/lib/cgi-bin/php5-fcgi" stderr: PHP message: PHP Warning:  require_once(Roundcube/bootstrap.php): failed to open stream: No such file or directory in /home/domain.it/extracms/webmail/program/include/iniset.php on line 63
[Wed Dec 24 09:46:37 2014] [error] [client ] FastCGI: server "/usr/lib/cgi-bin/php5-fcgi" stderr: PHP message: PHP Fatal error:  require_once(): Failed opening required 'Roundcube/bootstrap.php' (include_path='/usr/lib/cgi-bin/program/lib:.:/usr/share/pear:/usr/share/php') in /home/domain.it/extracms/webmail/program/include/iniset.php on line 63

Can you help me?
Thank you very much!