How do I use the GPL?

I downloaded “MyPassportWirelessPro-GPL-FW1_03_04.tgz”.

How do I know how to use it?

You don;t use it. it is for info only. Only use the official firmware releases.

You can build a working firmware from that source… I posted a thread a while ago about it… Ill see if I can fin

If you are still after it. its here: https://community.wd.com/t/buildroot-building-custom-f-w/163524