Chief Architect Premier X7 version 17.3.0.25 was a specific update for the professional 3D architectural design software, released around 2015. While the version you mentioned is often associated with "patches" or "cracks" on third-party file-sharing sites, the official software has since moved through several generations to the current Chief Architect Premier X16.
A patch is a software update that fixes bugs, glitches, or security vulnerabilities in a program. In this case, the patch for Chief Architect Premier X7 17.3.0.25 -x64- likely addresses specific issues or adds new features to the software.
Download the Core Catalogs for X7 from the Official Core Catalogs Page.
Using unauthorized versions of professional software violates licensing agreements and intellectual property laws. Official Resources