I am trying to install this for a client on his server and encountered an error I had never seen before: 406. To rule out a specific version I attempted to installed 3.0.15, .x.x.16, and 3.0.17 all encountered the same error between step 3 & 4 of the install process. Furthermore, when I try installing via Fantastico on his server, it will not assign the MySQL DB user to the database and therefore still won't install.

Then I have the problem that the .sql file is an include and there isn't a raw SQL file since it has the "table_prefix" option infront of all the table create statements...

Overall a very frustrating weekend.

Any suggestions?

Have you tried creating the db first on the cpanel MySql manager? makign a totally new user and assignign all permissions to the db for that user?Have you tried a MySql manager program to connect remotly with the username and password as above?
If this all works, try to install again.