A tip: you can also go to the same page on the internet. View the page source code in your web browser.
If you previously had comments enabled in the Stacks plugin (they should always be ‘on’ by default) then the Stacks plugin presents a list of meta tags towards the top the page (in the head section), listing all the stacks used to create that page:
From that list, you can determine what you might be missing or a particular version of a stack you need.
The above example came from https://www.realmacsoftware.com/ made with Foundry.