The PowerShell script to automate the upgrade for Veeam Backup & Replication & Enterprise Manager to v11 is now available on VeeamHub! Here’s a blog post with more detailed information:
https://www.arsano.ninja/2021/03/09/veeam-unattended-upgrade-v11/
If you're a VCSP, the script can also be used for Cloud Connect environment upgrades.