my(%dias, %dias_crontab);
%dias = %dias_crontab =     (
                             ...
                             );
[download]

Your regexps for extracting field data are actually too strict, you do not allow for whitespace between commas, or for non space whitespace.

You might want to take a glance at "a cron; in perl: But Why?!", and perhaps consider wrapping it in a shell to interface with Windows services?

--
perl -pew "s/\b;([mnst])/'$1/g"