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There are many Articles around the web that describe how to install OS X on a normal PC. But there is no full guide who describes how to update 10.5.1 to 10.5.4. So here is it.

Upgrade 10.5.1 to 10.5.2

  1. Download the 10.5.2 Combo Update (search Google) 343MB
  2. Go to /System/Library/Extensions/
  3. Start Update
  4. When AppleIntelCPUPowerManagement.kext apperars, move it to trash immediatly
  5. The install finishes, but do NOT click the restartbutton!
  6. Go to /System/InstallAtStartup/scripts/ and open the file 1 with a texteditor
    if you can’t access the folder     

    • rightclick > Get Info
    • at the bottom of the window it says Sharing & Permission, unlock it and click the plusbutton
    • Select your Username, press Select and change your permissions to read & write
  7. Find the string /System/Library/Extensions/Dont Steal Mac OS X.kext and replace it with /System/Library/Extensions/dsmos.kext
  8. Save the file and restart

Update 10.5.2 to 10.5.3

  1. Download the 10.5.3 Combo Update (search Google) 536MB
  2. Repeat steps 2 to 8 from above

Update 10.5.3 to 10.5.4

Just start the Apple Softwareupdate, download and install the 10.5.4 update.

Now you should have running OS X 10.5.4!

If you’ve any problems write a comment and I’ll help you!

Thanks to netkas.org (Update 10.5.2/10.5.3) and Infintite Mac (Update 10.5.4).