[fowlplay4]

I have troubles with the installer on 7 too but it actually spits out the Graal client so here ya go. See attached for client.

Instructions:

1. Create a Graal folder
2. Extract the Client to the Graal folder
3. Run Graal
4. Install Graphics, Sound, and other packages at Login / Server Select.

Graal will create the necessary folders when you start it up.

Edit: or just rename the GraalSetup.exe like Riot said.