Can't Install due to Cant execute command gunzip

[porkiey]

When I run the V3 auto installer on a FC4 Virtuozzo server I get as far as components then it dies and chucks out the following error:

Reading system installed packages...done.
Download file plesk-8.0.0-fc4-i386.hdr.gz: 42%..94%..100% done
Download file plesk-8.0.0-fc4-i386.hdr.gz: 12%..49%..95%..100% done
Can't execute command gunzip --stdout /root/psa/PSA_8.0.0/update-rpm-FedoraCore-4-i386/plesk-8.0.0-fc4-i386.hdr.gz
ERROR: Can't read updates headers file
ERROR: Installation failed



Has anyone got any ideas?