Someone may guess at an answer... but it would be much easier for those of us not gifted with psi powers if you were a bit more specific about (among other things):
what update.html?
Where (a naive search leads to nothing even vaguely plausible) did you find it?
How did you install(?) the "update" (if what you're asking about was alleged to be an update to WWW::Mechanize)?
What Perl?
What OS
How did you "tried" it? (Hint: showing the code is almost6 mandatory.)
How did it "stopped working"? Pick one: Error messages, warnings; incorrect output