Error 1639 indicates a problem installing the Sync desktop app on Windows. This is usually related to Windows permissions or how the app was installed previously.
How to fix this:
To resolve this issue, follow the steps below:
Confirm you’re using a Windows administrator account.
Complete a full uninstall of Sync using the uninstaller tool.
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Reinstall Sync and run the installer as administrator.
- Download the latest Sync desktop app for Windows:
- Right-click the installer file and select Run as administrator.
- Follow the on-screen steps to complete the installation.
Once these steps are complete, Sync should install without the 1639 error.
Still having trouble? Contact support.
If the issue persists after following these steps, please contact our support team with details about what took place when the error occurred so this can be investigated further.