You need to find your disk (probably floppies), this dates from before Adobe even had a web site, still less an online catalog to download.
Adobe yanked the trial versions of pagemaker from their website, so there are no legally downloadable versions of pagemaker available, you would need to have your installation key which is usually found on the cd cover anyway. You can try calling customer service, but they seem to sending the few pagemaker users here.
As previously said - the usual download sites refer the user to Adobe where you be met by "We are sorry, this product is no longer available for trial download". I don't recommend the shark infested waters of grey sites...