Your code seems to be able to be fixed somewhat by changing the 'array2' instances in the second loop to just say 'array'. I don't see where array2 is supposed to be coming from.. It's not declared anywhere else in the code.

It seems you're putting too much work into the code. If what you want is a listing of directories, you could do something as simple as

use strict;

opendir THISDIR, "." or die "serious dainbramagae: $!";

my $i = 0;
my @files = readdir THISDIR;

foreach (@files) {
   print "[", $i++, "] $_\t" if -d $_;
}

closedir THISDIR;
[download]

Or, for a more clean, concise way

use strict;

opendir THISDIR, "." or die "serious dainbramagae: $!";
my $i = 0;
print map { "[". $i++. "] $_\t" } grep { -d $_ } (readdir THISDIR);
closedir THISDIR;
[download]