To Install 10.5.7 Update:

1. Install the 10.5.7 Update from Apple Software Updates
2. Reinstall the ALC883 patch
3. You are done.
   

To Install 10.5.7 as a new install:

1. Follow the guide for 10.5.6 - but dont install the ALC883 Patch
2. Install 10.5.7 Update
3. Install the ALC883 Patch
4. You are done.
   

Contact me here.