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Why do I see a message about enabling Sideloading for LastPass?

    You may encounter this error message if you are a LastPass user with the LastPass for Windows Desktop application and/or the LastPass browser extension for Edge installed.

    Sideloading error for the LastPass for Windows Desktop application

    You may encounter the error message, "We detected that Sideload may not be enabled on your machine. To ensure the LastPass UWP application update is working correctly, please enable sideloading. For further information, contact your system administrator."

    Sideloading error for the LastPass browser extension for Edge

    You may encounter the error message, "We detected that LastPass extension of Internet Explorer is running. To continue LastPass update, the application needs to be closed."

    What is Sideloading?

    According to Microsoft, the Sideload apps setting is described as, "...typically used by companies or schools that need to install custom apps on managed devices without going through the Microsoft Store, or anyone else who needs to run apps from non-Microsoft sources. In this case, it's common for the organization to enforce a policy that disables the UWP apps setting."

    Regarding the difference between Developer Mode and Sideload apps, Microsoft states, "Sideload apps is a more secure option than Developer Mode because you cannot install apps on the device without a trusted certificate.

    Additionally, Microsoft advises, "If you sideload apps, you should still only install apps from trusted sources. When you install a sideloaded app that has not been certified by the Microsoft Store, you are agreeing that you have obtained all rights necessary to sideload the app and that you are solely responsible for any harm that results from installing and running the app."

    For more information, please see the Sideload apps section in the Microsoft support knowledgebase.

    What is causing this error?

    This error message may appear after installing the latest version of the LastPass for Windows Desktop application or LastPass browser extension for Edge, and the installer file for the latest version (Updater.exe) on the local machine cannot work properly because Sideloading is disabled (either enforced by an admin for a company machine, or enforced locally).

    Should I enable the Sideload apps setting?

    Please contact your system administrator for advisement on whether or not you should enable the Sideload apps setting.

    If you are a local administrator of your own personal machine or an administrator of a fleet of company machines, you can learn more about managing Sideload app settings from Microsoft.