Mac OS 9.1 Update - International English

Before you download Mac OS 9.1 Update, please be certain that you have read the system requirements for this update.

System Requirements:

  • International English Mac OS 9.0 or higher
  • Any PowerPC-based Apple computer with at least 32 MB of physical RAM, with virtual memory set to at least 64 MB.
    Note: Third party PowerPC upgrade cards are not supported


Compatibility Information:

Mac OS 9.1 and Mac OS X Public Beta - Important: The Mac OS X Public Beta and Mac OS 9.1 are not compatible. If you install Mac OS 9.1, the Classic environment in the Mac OS X Public Beta will no longer function.

Option 1 - Multiple Part Download
Below are the links for a multiple part download of the Mac OS 9.1 Update.

  • Please read the system requirements above to make sure that your are downloading the correct update for your system and language.
  • Once you have all the parts downloaded, go to your hard drive and double-click on "Mac OS 9.1 Update.smi" mounting the disk image on your desktop.
  • Read the documents included on this disk image before installing the software.


Download Part 1

Download Part 2

Download Part 3

Download Part 4

Download Part 5

Download Part 6

Download Part 07

Download Part 8

Download Part 9

Download Part 10

Download Part 11

Download Part 12

Download Part 13

Download Part 14

Download Part 15

Option 2 - Order CD
Apple recognizes that for many customers, downloading the update may not be convenient. Apple is offering the Mac OS 9 to Mac OS 9.1 Software Update program to allow customers who own any version of Mac OS 9 to obtain the Mac OS 9.1 full install CD. Details and an order form are available at

Note: If you have any of the following Macintosh computers:

  • Power Macintosh 6100 series
  • Power Macintosh 7100 series
  • Power Macintosh 8100 series
  • Power Macintosh 8115
  • Workgroup Server 6150
  • Workgroup Server 8150
  • Workgroup Server 9150

you must order the CD to upgrade to 9.1. For more information please see the following KnowledgeBase article.

Please send any comments on this page to:
(George W. Mills, Computing Service, University of Glasgow)