Big Sur mouse driver The Contour Mouse driver for macOS Big Sur is currently in BETA testing and available for download. You may encounter technical issues when using the driver until an official release is available. We encourage customer feedback for any issues encountered when using the BETA build. Please follow the steps below carefully to properly uninstall any previous Contour Mouse drivers, and install the BETA driver. These steps differ from previous instructions we have provided for earlier versions of macOS. 1. Disconnect any Contour device connected to the Mac. 2. Uninstall the Contour Mouse driver using the Contour Mouse Uninstaller found in the Help menu of the Contour Mouse app. 3. Restart the Mac. 4. Open the Contour Mouse disk image (.dmg file) located in the Downloads folder or on the Desktop. If you received the disk image by email, do not double-click it inside Mail. Move it to the Desktop first. 5. Find the Contour Mouse app in the disk image and drag it to the Applications folder. 6. Eject the disk image. 7. Open the Contour Mouse app located in the Applications folder. Make sure you do not open the copy that is on the disk image. 8. When the System Extension Blocked warning pops up, click Open Security Preferences. 9. Click the yellow lock at the bottom left corner of the System Preferences window. 10. Enter your password. You must be in an administrator account to install the driver. 11. Click the Allow button next to “System software from application Contour Mouse was blocked from loading”. 12. Connect the Contour Mouse or keyboard device to the Mac.