This is the way, except that you should use $RealBin instead of $Bin. $Bin is buggy since it breaks when a symlink to the executable is used.

In this case:

use FindBin qw( $RealBin );
use lib $RealBin;
[download]

When you have bin/ and lib/:

use FindBin qw( $RealBin );
use lib "$RealBin/../lib";
[download]