Adobe stopped supporting CS6 years ago. It doesn't run natively on modern macOS (Catalina and later) and may have issues on Windows 10/11.
To use InDesign CS6 Portable, you will need: indesign cs6 portable new
If you are looking for the power of InDesign without the modern subscription or the risks of portable files, consider these legitimate paths: InDesign CS6 version - Adobe Community Adobe stopped supporting CS6 years ago
Strictly speaking, ever released by Adobe. The software was originally designed as a heavy desktop application requiring a full installation and activation via serial number. and PDF forms—with remarkable stability. Portability
: It still handles the fundamentals—liquid layouts, alternate layouts, and PDF forms—with remarkable stability. Portability