I find this hard to believe, even running spl.pl with no arguments outputs something:

C:\>perl spy.pl
Version: v0.02
Usage:
        spy.pl --help
        spy.pl --all
        spy.pl --title TITLE

As the output is quite verbose, probably you'll want to redirect
the output to a file:   spy.pl options > out.txt
[download]

Run perl spy.pl --all and examine the output.