Problem 1: Computer not supported error
This is caused by the system definition not being MacPro3,1/4,1/5,1.
Fix: Edit the "Distribution" file within the package using the Flat Package Editor.
- Download the Flat Package Editor (FPE) from Apple: https://developer.apple.com/downloads/index.action
- Login and search for "Auxillary Tools"
- Download the "Late July 2012" dmg
- Mount the dmg and right click Package Maker to show the package contents
- Browse to /Contents/Resources and copy the FPE to your Applications or Utilities folder
- Open the NVIDIA Web Driver package using the Flat Package Editor
- Drag the Distribution file to your desktop
- Open the Distribution file using TextEdit
- Scroll down to the line: var system_models = ["MacPro3,1", "MacPro4,1", "MacPro5,1"];
- Add your system ID.
- Make sure that you don't use smart quotes which look like italicized quotation marks.
- Save the Distribution file
- Go back to FPE and delete the Distribution file from that window
- Drag the edited Distribution file to the FPE window and save the package, command+S
- Run the package and you shouldn't get the error.
NOTE: Once the drivers are installed this doesn't matter anymore and you can use any system definition you like and it will update fine.