While DSC (now part of Johnson Controls) archives older software, they often restrict public access. For technicians who need immediate access to this legacy tool, it is most reliably found through industry repositories.
Buy a used Dell Latitude or IBM ThinkPad with Windows XP. Install DLS 2002 directly. This is the most reliable field programming solution. dsc dls 2002 download software link
Before downloading, ensure your PC meets these requirements (for DLS IV / DLS 5): While DSC (now part of Johnson Controls) archives
Even after you find a legitimate , you will face a second hurdle: the software was built for Windows 95, 98, or XP. It will not run natively on Windows 10 or 11. Here is the solution: dsc dls 2002 download software link