I currently use ZCS_4.5.9_Debian 3.1 FOSS on a Debian 4.0_32bit.
Now I need to move on a new server running Debian 4.0_64bit,
and I'd like to upgrade to the last ZCS_5.0.8.

What is best way to upgrade and to import all data ?
May I install ZCS_5.0.8_UBUNTU_64bit ?

Thanks.