Now just click on the Finish button and wait for a little for a successful Office 2019 activation. Step 4: Open the activation panel and copy-paste the Office 2019 product key into that. Step 3: Unzip and install the KMSPico Office activator. Step 2: Download KMSPico Office 201 9Activator from its official site. Step-1: Turn off the Windows firewall and real-time protection.