The cautious-file package
has not been updated by the maintainer, Robin Green, since 2013 (though there have been a few Hackage trustee updates since then). The linked source repository was hosted on
patch-tag.com and no longer exists. I tried contacting the maintainer on January 25 but have not heard back.
I hereby announce my intention to take over as maintainer of the package. (As a side note, as far as I know my diagrams-haddock package is the only thing on Hackage that depends on it.)
Alternatively, if anyone knows of a different, actively maintained package that provides similar functionality, I'd love to hear about it!
-Brent