Dear Doctor Mark Anderson,
This link generate an error, [2021/06/28 14:28:50]
What’s new in v9 > New to version 9 > [https://www.acrobatfaq.com/atbref9/index/index/ChangeLog/v900b52327Jun2021.html]
The requested URL was not found on this server.
Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.
See change log for v9.0.0 baseline.