The latest version of DS4 Pro is in a zip file for the PC. When you run DAZ Studio, go to Help > About DAZ Studio, and it will tell you the version number. For example, I downloaded the latest DS4 Pro on the 16th June, and it is version 4.5.0,.49 Release Candidate 2 (RC2). It is in a zip file with the required plugins included.
As I said earlier, the last two digits of the version number for the plugin MUST match the last two digits of the version of DS4 Pro that you are running. You must also install the correct bit depth, in other words, you must install the 32 bit version of the plugin for the 32 bit version of DS4 Pro, and the same goes for the 64 bit version.