Look for minRam and the processor speed requirments, and change these, and any other options which could prevent install on your setup. It's an xml script, so you can just edit it. Open the Distribution file in a text editor, for example I use BBEdit.Go into the OSInstall folder, and you'll see a Distribution file and Packages folder.Go into Terminal and cd into this folder, then issue the following command to decompress the mpkg to the folder: $ xar -x -f /path/to/OSInstall.mpkg Create a new folder on the desktop, eg OSInstall. For 10.5, the package we want is in /System » Installation » Packages/ folder on the drive with 10.5, and is called OSInstall.mpkg. Copy the required mpkg to the desktop.Check that the install is in the right location (/usr » local » bin » xar) by issuing which xar it should return the aforementioned location.Issue the folowing commands, pressing Return between each one and then waiting for its completion (Developer Tools required): $.Expand the tar.gz file and open terminal and cd into its directory.If this was 10.4, we could simply edit the Distribution file in the mpkg file, but Apple has changed things - they now use xar to compress the mpkg file, so we'll need to decompress the mpkg file and then edit the Distribution file. Drag the DVD to the source area and the drive/partition to the destination area, and start the restore. Then launch Disk Utility and select the drive/partition to restore the DVD onto. It is as simple as attaching the drive and inserting the DVD into the machine. I typically use an external FireWire drive for this. We first need to restore the 10.5 DVD onto a read/write media. I doubt I'll be alone here.Īll is not lost, however, as it is possible to modify the file that checks the machine specs and decides if 10.5 can be installed. For example, my trusty G4 fails to meet the minimum processor requirements - it has enough RAM to run 10.5, but the installer prevents me from installing. Apple usually weeds out a few machines with new versions of OS X, but 10.5 is the first release I'm aware of that will exclude a larger number of machines from being able to run the new OS.
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