Hello Tom!
Based on the browsing results, the original article does not appear to contain the code examples directly. The link provided in the article for the download is no longer working due to the "KeyBasedAuthenticationNotPermitted" error. This is a common issue with Azure Blob Storage links that have a time-limited Shared Access Signature (SAS) token. Even though the expiration date on the token you provided is far in the future, the key may have been revoked or the file moved, rendering the link invalid.
While I could not directly download the file for you, I have found that the code examples from this article have been migrated to a public GitHub repository. You can view the PowerShell script by navigating to the following page:
PowerShell Script to Discover PowerApps with Custom Connectors:
GitHub Repository: https://github.com/microsoft/PowerApps-Admin-Tools/tree/master/DiscoverResourcesScripts
Direct File Link: https://github.com/microsoft/PowerApps-Admin-Tools/blob/master/DiscoverResourcesScripts/findPowerAppsWithCustomConnectors.ps1
You can copy the code directly from this page or download the entire script from the repository.
I hope this helps!
~Jesse