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If PowerPoint shows a save error while Grunt is installed, one possible cause is an architecture mismatch between Microsoft Office and the Grunt add-in.

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Why architecture matters

The current Grunt release ships as a 64-bit (x64) COM add-in, with an arm64 variant for Windows on ARM. Grunt does not ship a 32-bit build. If your Office installation is 32-bit, the Grunt add-in will not load. Symptoms of a mismatch include:
  • Grunt tab missing
  • Save failures
  • Crashes or unexpected behavior

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Check your Office architecture

  1. Open PowerPoint or another Office app.
  2. Open File.
  3. Choose Account.
  4. Look under Product Information to confirm whether Office is 32-bit or 64-bit.

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Fix the mismatch

If Office is 32-bit, upgrade Office to 64-bit. Microsoft 365 installs are 64-bit by default. If your organization controls Office deployment, ask IT to switch to the 64-bit channel. If you are on a Windows on ARM device, use the arm64 Grunt installer from app.grunt.pro/download. If your organization controls deployment centrally, ask IT to distribute the matching package.

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32-bit Office support is being phased out

Grunt no longer publishes a 32-bit installer on the main download page. If your organization still runs 32-bit Office:
  • Contact support for a direct link to the current stable 32-bit release
  • Plan to upgrade to 64-bit Office — Microsoft 365 installs are 64-bit by default
  • 32-bit support will be fully discontinued once the .NET 9 migration is complete