http://www.columbia.edu/~em36/wpdos/links.html#obtain
There is still a community (apparently mostly paralegals) who actively use it and answer questions, e.g. http://wpdos.org and https://www.wpuniverse.com/
Looks like they deleted the file ... now 404 not found...
It's also an odd little page. It includes directions to buy it, if you already have a copy. If you don't have a copy, it includes some details on how to use eBay.
http://www.columbia.edu/~em36/wpdos/links.html#obtain
There is still a community (apparently mostly paralegals) who actively use it and answer questions, e.g. http://wpdos.org and https://www.wpuniverse.com/