I am a Zivver admin
Configure and manage Zivver
Download link for Zivver Office Plugin v6.21.0
Click here to download Zivver Office Plugin version 6.21.0: https://downloads.zivver.com/officeplugin/releases/6.21.0/Zivver.OfficePlugin.Installer-6.21.0.msi.
The Release Notes can be found in Zivver Office Plugin Release Notes 6.21.0.