XenServer 6 install - no need for supplemental pack

http://blogs.citrix.com/2011/09/30/xenserver-6-0-is-here/
The Linux supplemental pack has been removed, so there is only 1 base installation CD.  “Linux demo VM” functionality has been moved to a virtual appliance format so it can be easily imported into a host or resource pool.

http://blog.hostduplex.com/2011/02/23/how-to-install-xenserver/