Can’t switch from Office 365 to Office

If you try to install Office 2019, Office 2016, or Office 2013 and you get an “invalid product key” message, the problem might be that you already have Office 365 or an Office 365 Trial installed. Before you can install Office, you’ll need to remove Office 365.

Uninstall Office 365 and install Office

  1. Click this easy fix button to uninstall Office.

    Easy fix download button indicating an automated fix is available
  2. For the remaining steps showing how to save and use the easy fix, select your browser from the drop-down list below:

    1. At the bottom of the browser window, select Open to open the O15CTRRemove.diagcab file.

      Select Open to open the O15CTRRemove.diagcab easy fix tool

      If the file doesn’t open automatically, choose Save > Open Folder, and then double-click the file (it should start with "O15CTRRemove") to run the easy fix tool.

    2. The Uninstall Microsoft Office wizard launches. Select Next and follow the prompts.

    3. When you see the Uninstallation successful screen, follow the prompt to restart your computer for the changes to take effect. Select Next.

    4. Restart your computer and then try installing Office again.

    To reinstall Office select the version you want to install and follow those steps.

    Office 365
    Office 2019
    Office 2016
    Office 2013

    1. In the lower-lower left corner select the o15CTRRemove file and from the drop down, select Show in folder.

      From the dropdown, select Show in folder

      Double-click the download, o15CTRRemove to run the easy fix tool.

    2. The Uninstall Microsoft Office wizard launches. Select Next and follow the prompts.

    3. When you see the Uninstallation successful screen, follow the prompt to restart your computer for the changes to take effect. Select Next.

    4. Restart your computer and then try installing Office again.

    To reinstall Office select the version you want to install and follow those steps.

    Office 365
    Office 2019
    Office 2016
    Office 2013

    1. Select Save File, and then OK.

      Save O15CTRRemove.diagcab file in Firefox

      In the upper-right browser window, select Show all downloads. In the Library, select Downloads > O15CTRRemove.diagcab, and then select the folder icon. Double-click the O15CTRRemove.diagcab.

    2. The Uninstall Microsoft Office wizard launches. Select Next and follow the prompts.

    3. When you see the Uninstallation successful screen, follow the prompt to restart your computer for the changes to take effect. Select Next.

    4. Restart your computer and then try installing Office again.

    To reinstall Office select the version you want to install and follow those steps.

    Office 365
    Office 2019
    Office 2016
    Office 2013

Expand your Office skills
Explore training
Get new features first
Join Office Insiders

Was this information helpful?

Thank you for your feedback!

Thank you for your feedback! It sounds like it might be helpful to connect you to one of our Office support agents.

×