Code Composer Studio 5.5 is considered legacy software . Texas Instruments (TI) officially ended support for the CCSv5.x family several years ago. It has been replaced by CCSv8, v10, and v12 (the current version). However, legacy projects (e.g., older DSPs like the C6000 or specific ARM Cortex-A8/A9) often require v5.5 to maintain compiler compatibility. How to Download and Install Code Composer Studio 5.5 If you are maintaining older embedded systems or working with legacy TI hardware (such as the OMAP-L138, C6748, or early Sitara AM335x), you may find that the latest version of CCS refuses to import your old project without major migration headaches. In these cases, CCS 5.5 is the "golden key."