Well, I'm not the best person to answer this question as I never use ActiveState or ppm. But as I understand it, you don't need the CPAN download in order to install a ppm module, you simply type ppm at the command line and then install IO::Tty at the ppm prompt. ppm will then go and get everything it needs from the Activestate module repository.

You can get more information about ppm on the Activestate web site.

Update: It seems from the other discussion that you started on this subject that IO::Tty isn't available from ppm.