All....
I am trying to install vsifax on a 64 bit Centos 5.1 system. The Esker staff have been helpful but no cigar.
At first they thought the problem might be related to a 64 bit machine so I tried to install vsifax on a 32 bit Centos 5.1 machine and received the same error.
One of their installation scripts is trying to execute a binary called eula which fails.
./eula: cannot execute binary file
maybe just retry after invoking that command ? chmod +x eula