CS6 was built for Windows 7. Portable repacks don’t update the core code. On Windows 10/11, you will likely see:
If you need CS6 specifically, buy a used official license key (hard to find) or subscribe to InDesign CC for a single month. If you just need to view a file, use the WinRAR trick above.
A free, open-source desktop publishing tool that is safe and regularly updated.