You can use PowerPack Beaver Addons on a WordPress Multisite Network. Make sure that Beaver Builder and PowerPack are Network activated from the Plugins page.

It’s important to have an active license key to receive updates directly in your WordPress dashboard. Follow these steps to activate your license key:

1. Get your License Key from My Account section on the site.
2. Go to Network Admin > Settings > PowerPack
3. Enter your License Key and click the blue Save Changes button
4. Now, click the button to Activate the license key.