Despite being over a decade old, developers often seek "Code Composer Studio 5.5 download patched" versions for several reasons:

You do not need to look for unofficial "patched" versions from third-party sites, which can be risky. Texas Instruments has made legacy versions freely available with simplified licensing. CCSTUDIO IDE, configuration, compiler or debugger | TI.com

CCS v5.5 is compatible with older operating systems like Windows XP, Vista, and Windows 7, which may be required for older industrial control PCs. How to Download and License CCS 5.5