The method File.exists? has long been deprecated, but worked.
In the latest Ruby version it doesn’t - File.exist? - works in v2024 and older versions as well.
Developers are working to adjust their code accordingly.
Have patience and post any instances here as there are 100s of 1000s of line of code with the tiniest corrections needing to be found and change, then the extension re-encrypted and signed…
Many authors have already fixed their extensions, so look to see if there’s already an update available…