found this on tpb:
Installing Logic Studio 9:
1. Mount "Logic Studio Install.dmg"
2. Choose to install whichever applications, tools and sound libraries you want using the following serial:
3. Depending on what files you decided to install you may need to mount several of the other DMGs contained in this folder during installation. Just keep mounting the appropriate disk images as the installer prompts you for them.
4. Update your applications to their latest versions using Apple Software Update (found in the 'Apple' menu)
5. Download this file: http://thepiratebay.org/torrent/5744335/Pro_Apps_2010_Volume_License
6. Unzip "Pro_Apps_2010.zip"
7. Move the files from the "Pro Apps 2010" folder to this location:
Choose to overwrite files if prompted.
8. Launch Logic and rejoice!
After updating using Apple Software Update, double applications may have been created in your Applications folder. This is because the updated versions have intel x64 support and are therefore incompatible with PPC-based hardware drivers.
The installer keeps a copy of the original versions (which are universal binaries) for compatibility. If you don't use any audio hardware that depends on PPC-compatible drivers, you can just delete the universal binaries to save space.
The ones you want to delete are those which have their version number written inside brackets.
Example: "Logic Pro (9.0.0).app" etc.
Oh, and one last thing. Some of the updated apps does indeed come with 64-bit support, but are run in 32-bit mode by default, again for compatibility. If you wish to run them in 64-bit mode, all you have to do is select the App in your Applications folder, hit CMD+I (get info) and uncheck the box that says "Run in 32-bit mode". Should you ever run in to problems running in 64-bit mode, you can just revert to 32-bit by checking that box again.
64-bit mode will ONLY work on Mac OS X 6.x (Snow Leopard) or above.