Upgrading Mac OS (to High or Mojave) may not be possible if you are still running older versions of some non-apple software


Increasing speed and performance by up to 400% is possible on older Macs by replacing the HDD with an SSD or a new HDD. However, you may not be able to upgrade the OS if you are running any of the following non-apple software products.

Adobe Creative Suite Software


  • , CS3, CS4, CS5 will ONLY work with OS X 10.9/Mavericks or earlier. They will NOT work with Yosemite, El Capitan or Sierra.
  • Adobe CS6 will work on OS up OS X 10.10/Yosemite. They will NOT work with El Capitan or Sierra.
  • Only CC (Creative Cloud) is guaranteed to work on El Capitan and Sierra

Adobe Acrobat Pro 8


Will NOT work with YosemiteEl Capitan or Sierra

or Earlier


After cloning early versions of Office to a new HDD or SSD, sometimes the office key is sometimes requested. Make sure you have this at hand before attempting an upgrade. If you misplace it you will need to buy it all over again or better still install Office 365.



Parallels Desktop 9 for Mac and earlier versions do not support macOS Sierra.

While Parallels Desktop 10 will run your virtual machines on macOS Sierra, you will not be able to access your Windows files with Mac applications and a new installation of Parallels Desktop 10 will not work on macOS Sierra.

To enjoy all new features of macOS Sierra and full compatibility please upgrade to Parallels Desktop 12 for Mac.

Quicken Essentials for Mac


Does not work with Sierra

! Messenger


Will NOT work with El Capitan or Sierra

Other Software

The above list is just a few of many well used programs that have been identified as having issues. If you have other non-Mac programs not listed here, check with the authors about compatibility before attempting any OS upgrade.

Need more help?

Covid-19 Update: Business as usual for workshop repairs, and onsite support.

If you live in Western Australia, and you need any kind of computer help, please bring your computer to us at 315 Rokeby Road, Subiaco, Western Australia or call us out. You can email us at helpdesk@itguyswa.com.au or call:

08 6118 2601 

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