my $directory =  '/home/psimo/it441/challenge/logs';
...
open(FH, '<', '/home/psimo/it441/challenge/logs/$theFile') or die "CAN
+'T OPEN FILE! you don't have the log file\n";
[download]

Since you have the directory hardcoded, you should say:

open FH, '<', "$directory/$theFile" or die "CAN'T OPEN FILE! you don't
+ have the log file\n";
[download]

Note the usage of double quotes in my suggestion. Single quotes take $theFile as literal, while double quotes interpolate the variables content.