From what I remember not all servers have the same configuration for fantastico (perhaps just not all running the same up to date version), you may or may not have smf available for installation (also, just to avoid confusion, you are not downloading anything from fantastico, your are installing a copy of the script onto your account)

__________________

Register/Login Script
Do you use a Password Protected Directory? Need a way to allow users to make their own account, try my .htaccess Login Script