We stand with Ukraine to help keep people safe. Join us
All Apps
Best AppsReviewsComparisonsHow-To
When you purchase through links on our site, we may earn an affiliate commission

XPostFacto for Mac

Install OS X (up to 10.4) on unsupported PowerPC Macs.

Free
In English
Version 4.0
4.5
Based on 33 user rates

XPostFacto overview

XPostFacto... While Apple has limited its support for Mac OS X to those machines that originally came with a G3 or G4 processor, it is possible to install Mac OS X on some earlier machines. The unsupported machines that work now are the 7300, 7500, 7600, 8500, 8600, 9500 and 9600, as well the clones that were based on one of these systems (the Umax S900 and J700, and the Power Computing PowerWave and PowerTower Pro). The original processors in these machines will work (with the exception of the 7500, which requires a processor upgrade). G3 or G4 upgrade cards work as well. Other models that use the PCI architecture may be made to work in time

What’s new in version 4.0

Version 4.0:
  • Supports Mac OS X 10.4 (Tiger)!
  • Runs on Mac OS 9.x or 10.2 through 10.4.
  • Will install Mac OS X 10.2 through 10.4.
  • Works with "New World" machines that Apple dropped support for in 10.4 (such as the original iMac, original iBook, and the Lombard Powerbook).
  • Avoids the mis-application of the 8 GB limit on "Old World" machines by the Mac OS X Installer.

XPostFacto for Mac

Free
In English
Version 4.0

What users say about XPostFacto

Try our new feature and write a detailed review about XPostFacto

Write your thoughts in our old-fashioned comment

MacUpdate Comment Policy. We strongly recommend leaving comments, however comments with abusive words, bullying, personal attacks of any type will be moderated.
4.5

(113 Reviews of XPostFacto)

  • Comments

  • User Ratings

Wts
Wts
Apr 6 2014
4.0
5.0
Apr 6 2014
5.0
Version: 4.0
I have used XPostFacto many years ago to trick an 8500 to think it could run OS Tiger. It did the job albeit the 8500 running OX Tiger was SSSLLLOOOWWW. Todays problem for me is that when i click the download button on this page it comes up as an all text page. What the...???? How do i get an executable application rather then a all text page(s) ?
Woofer
Woofer
Sep 28 2007
4.0
0.0
Sep 28 2007
0.0
Version: 4.0
I'm just wondering/hoping, if this niffty little programme might be updated soon to let users with under 900MHz G4 Macs to install OS X 10.5? It seems Apple have limited 10.5 for either Intel users or better than 900MHz G4's Fingers x-ed.....
Mactinker
Mactinker
Jun 22 2007
4.0
0.0
Jun 22 2007
0.0
Version: 4.0
Hi! XPF was recommended to me by a list mod to help in installing 10.3 on a beige G3 AIO. I have asked Apple and they tell me that 10.2 will install and run on this Mac just fine. I went to the list in question looking for 10.2. But the list mod was very encouraging about the superiority of 10.3 over 10.2, so I tried to dl XPF4. I got a page of very strange code, and no actual dl at all. Thought you'd want to know about that. Three questions: 1. Does anyone know what I might have done wrong in the dl process? I clicked the "Download now" button, that's all, and all that appeared to be necessary. Or maybe it can't dl to OS9? 2. If I can get hold of a set of 10.2 CDs, do I still need XPF? (Apple says no, just fyi, but if *users* have different actual experience, that's helpful to know.) 3. (Slightly OT) If I could just go altogether with X I wouldn't ask this, but: Does anyone have an opinion whether 10.3 is really so much better than 10.2 that I need to add to the complication of making the switch? It's going to be tight in the first place, as I need to partition the HD so I can have one side w/ OSX and the other w/ OS9, because I actually do use the built-in floppy and zip drives, both unsupported under all versions of X. Can't go get a USB floppy drive, because the AIO does not have USB ports, which are required by 10.3. Thanks for your time.
Guest
Guest
Nov 4 2005
4.0
4.0
Nov 4 2005
4.0
Version: 4.0
hi, this utility is great, i was able to run the cd installation of mac os X 10.2 in my Power Macintosh 8600 but i had a problem, everything was fine running the installation until i had to choose a selection disk for the installation, the program said that "you cannot install MacOs X on this disk. An erlier version of Mac Os X is not installed" can anybody help to solve this problem? what can i do????
Paynito
Paynito
Oct 9 2005
4.0
5.0
Oct 9 2005
5.0
Version: 4.0
Just installed 10.4 on Lombard 400MHz/320 MB, cannot shutdown cleanly, it hangs on "double kernel panic, I'm hanging here" any ideas? -- I was a very happy user of Xpostfacto on my 9500/g4450 with 10.3
Wts
Wts
Apr 6 2014
5.0
Apr 6 2014
5.0
Version: null
Guest
Guest
Nov 4 2005
4.0
Nov 4 2005
4.0
Version: null
Paynito
Paynito
Oct 9 2005
5.0
Oct 9 2005
5.0
Version: null
Guest
Guest
Apr 23 2005
4.3
Apr 23 2005
4.3
Version: null
Usingpond
Usingpond
Apr 4 2005
4.0
Apr 4 2005
4.0
Version: null
Guest
Guest
Apr 2 2005
4.3
Apr 2 2005
4.3
Version: null
Guest
Guest
Dec 8 2004
4.0
Dec 8 2004
4.0
Version: null
danpinto@me.com
danpinto@me.com
Dec 8 2004
4.8
Dec 8 2004
4.8
Version: null
Geobulga
Geobulga
Dec 4 2004
2.3
Dec 4 2004
2.3
Version: null
Guest
Guest
Aug 28 2004
5.0
Aug 28 2004
5.0
Version: null
Guest
Guest
Aug 2 2004
5.0
Aug 2 2004
5.0
Version: null
Guest
Guest
Jul 14 2004
4.3
Jul 14 2004
4.3
Version: null
Guest
Guest
Jul 4 2004
4.5
Jul 4 2004
4.5
Version: null
Guest
Guest
Jun 19 2004
3.8
Jun 19 2004
3.8
Version: null
Guest
Guest
May 17 2004
4.8
May 17 2004
4.8
Version: null
Guest
Guest
May 9 2004
5.0
May 9 2004
5.0
Version: null
Davy-gravy
Davy-gravy
Apr 29 2004
4.0
Apr 29 2004
4.0
Version: null
Guest
Guest
Apr 4 2004
4.8
Apr 4 2004
4.8
Version: null
Michael Riechert
Michael Riechert
Mar 30 2004
5.0
Mar 30 2004
5.0
Version: null
Guest
Guest
Jan 29 2004
5.0
Jan 29 2004
5.0
Version: null
Guest
Guest
Jan 27 2004
5.0
Jan 27 2004
5.0
Version: null
Jwilson13
Jwilson13
Jan 27 2004
4.8
Jan 27 2004
4.8
Version: null
Guest
Guest
Dec 14 2003
4.8
Dec 14 2003
4.8
Version: null
Guest
Guest
Dec 11 2003
4.3
Dec 11 2003
4.3
Version: null
Rhodee
Rhodee
Nov 26 2003
5.0
Nov 26 2003
5.0
Version: null
Pawn1
Pawn1
Nov 26 2003
4.5
Nov 26 2003
4.5
Version: null
Guest
Guest
Nov 25 2003
3.0
Nov 25 2003
3.0
Version: null
Guest
Guest
Nov 18 2003
5.0
Nov 18 2003
5.0
Version: null
Guest
Guest
Nov 5 2003
5.0
Nov 5 2003
5.0
Version: null
Guest
Guest
Sep 4 2003
4.0
Sep 4 2003
4.0
Version: null
Darkstranger
Darkstranger
Jan 17 2003
5.0
Jan 17 2003
5.0
Version: null
Guest
Guest
Sep 4 2002
5.0
Sep 4 2002
5.0
Version: null
Phripley
Phripley
Aug 11 2002
4.5
Aug 11 2002
4.5
Version: null