The code from my talk today at SQL Saturday Jacksonville is available in GitHub in a repo: Zero Downtime
There is a description in the readme, but you can open the DBClient folder and the VS solution for ZeroDowntime in there in VS 2019 and run it.
The SQL Code is numbered in order in the SQL folder.
If you have questions, please feel free to contact me or submit an issue on GitHub. Please feel free to use this presentation at your own employer or usergroup.