The PSC04 is NOT a PLM. It is an X10Pro Power Line X10 Transmitter Interface.
Uses a completely different communications protocol.
The Insteon 2413S and Smartenit 5010K module will not work.
X10 shows the PSC04 as out of stock. Though it is still being sold when back in stock.
If you go to their web site. You can have a email sent to you when back in stock. If you can’t find another source.