The download in question was for a driver installer for PostScript drivers for Windows'95, Windows'98, Windows NT 4, Windows 2000, and Windows XP (32 bit) systems. For systems other than Windows 2000 and XP, the installer provided a driver known as AdobePS and for Windows 2000 and XP, it used the PSCRIPT5.DLL driver (a joint project of Adobe and Microsoft) that shipped with those versions of Windows. This installer allowed you to create a driver instance for a designated printer port and a user-provided PPD file.
This driver installer does not work with any Windows system later than Windows XP or with any 64-bit version of Windows.
There has been no plan to update that installer (it was actually a 16-bit installer!!) and since it doesn't work with any operating system supported today, it was removed from Adobe's website.
Today, for older PostScript printers, Microsoft provides most PPD files and a method of installing such printer driver instances. Most printer vendors do provide installers that provide the functionality of Adobe's old driver installer, but customized for their printer models.
- Dov