Knowledge base KB0238

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Launching PowerPoint or Excel on an M1 Mac displays the error message: "Rosetta is not supported"

Problem

When I launch PowerPoint or Excel, I receive the following message:

think-cell does not support Rosetta. Please use native Office instead.

Solution

The message you saw indicates that Rosetta mode is active. Please switch Office to native mode by following the steps below (note that these settings are separate for each Office application, so you may need to apply the changes to both PowerPoint and Excel):

  1. Completely quit out of all Office apps, for example by right-clicking the icon in the dock
  2. Open Finder > Applications
  3. Select Excel and go to File > Get Info in the menu bar, or press Cmd ⌘ + I
  4. If there is a check mark for Open using Rosetta, uncheck it Change Rosetta or Native Mode for Office apps.
  5. Repeat these steps for PowerPoint as well

Please also ensure that your Office installation is up to date, and you are using the latest version of think-cell. You can always download the current version from our download web page.

Background

On the new Apple M1 platform (Apple Silicon), Office can be executed in two modes:

  • Within Rosetta, which is Apple's translator software that allows programs designed for Intel CPUs to run on M1 machines
  • Native mode, using the version of Office designed to be compatible with M1 machines

think-cell can only work with Office in native mode on M1 devices. Microsoft also recommends using native mode in almost all circumstances.

As noted by Microsoft, it is recommended to use Office 2019/2021 and Microsoft 365 (Office 365), from version 16.55.2207.0 onward (in the case of Office 2021, version 16.53 or later).

To check which Office version is installed, open PowerPoint and from the application menu, choose PowerPoint > About PowerPoint. This will open a dialog box that shows the version number.