Error message in Word and PowerPoint for macOS in Catalina and Big Sur caused by previous MathType installation

TechNote 179

Computers upgraded to macOS Catalina or Big Sur when MathType for Mac was installed on macOS Mojave (or earlier).

Crashes related to MathType installation files when opening PowerPoint or Word.

This error message can appear when you open PowerPoint:


These errors messages appear when you open Word or you click in the remnant 'MathType' tab in Word:


As a temporary workaround, you should manually delete the remaining MathType files from your system. Find and delete the following files:

  • MathType Commands 2016.dotm
  • MathType Commands 2016.ppam
  • MathType.bundle
  • MathType.reg

Doing this manual action will avoid any crashes of Word or PowerPoint due to the previous installation of MathType, although you may receive an error message from time to time. We will release a 64-bit MathType uninstaller in the coming weeks that will remove the files and permanently resolve this issue.

We hope this has been helpful. As always, please let us know if you have questions about this or additional techniques that work. We'd love to hear from you.