Download the new version from your account page:
https://store.stardock.com/login.aspx?ReturnUrl=/myaccount/products
Temporarily disable your antivirus
Deactivate the currently installed version of WB from within WBConfig
Uninstall the currently installed version of WB
Reboot
Temporarily disable your antivirus
Install the new version of WB
Activate the new version of WB
Re-enable your anti-virus
Reboot.