FWIW here is some code that will show you which repositories a given package is available from.

use strict;
use PPM::UI;

my $target_list = PPM::UI::target_list();
my $rep_list = PPM::UI::repository_list();

my $list = PPM::UI::search( $rep_list->result, $target_list->result->[
+0], "Win32-FileOp", 1 );

my @arr = $list->{ "result" };

my $piece;
foreach $piece ( @arr )
{
    my $piece0;
    foreach $piece0 ( @$piece)
    {
        print $piece0->{ "reps" }->[0]->{ "url_base" };
        print "\n";
    }
}
[download]

I don't understand all the nuances yet. Not by a long shot.

Ill work on getting the PPM::Installer to be useful.