im sorry but i have looked and looked for the answer to this question but i have not found the answer i have tried the /Silent /sn=xxxx-xxxx-xxxx-xxxx-xxxx-xxxx /write_sn /noreboot switches and it installs but without the serial number i get a your demo has expired msg but when i install it manually it works fine i have version 6.0.0.0 and i have the update to 6.6.0.14