Install 2.2.6 on Debian Etch?

[dabro]

I'm upgrading to a new box running Debian Etch from a Fedora 5 installation. I've been using ISPConfig 2.2.6 on the old box. I wanted to install 2.2.6 on the Debian box and do a sql restore to install my old websites into the new box. I can't get 2.2.6 to install, it says that Debian 4.0 is not supported? I've found threads searching here about people using 2.2.6 on Etch. I'm planning to upgrade to 2.2.16 but I remember vaguely that you can't restore into a later version installation. I think I need to have 2.2.6 installed first, maybe I'm wrong? Any help would be appreciated, Dave