We desire to make all Renewed Vision products compatible with macOS 11 (Big Sur) as soon as possible, and have tested our products throughout the beta period. This testing has revealed several issues, some of which have been fixed by Apple in later beta releases, some of which require the work of third parties, and others that we need to work around ourselves. We strongly recommend waiting to update your operating system until we have confirmed compatibility as there are lots of changes that occur up to the final Gold Master.
All mission critical computers should have "auto-update" turned off. You can do this by unchecking the "Install macOS updates" option in System Preferences > Software Update > Advanced.
At the time this has been written (October 12, 2020), Blackmagic Design DeckLink/UltraStudio products are incompatible with Big Sur altogether.
We will update this article when more information on compatibility for our products is available.