If your goal is to access or edit old CS4 files, there are safer, official alternatives:
This combination creates a powerful, yet legally and technically complex solution for designers who need access to legacy publishing tools. Typically, a genuine installation of InDesign CS4 requires a DVD-ROM drive and a serial number. The "portable" versions bypass these requirements. i adobe indesign cs4 portable mega install
For students, hobbyists, or those working on budget-conscious community projects, open-source software provides a completely legal and cost-free solution: If your goal is to access or edit
: Using unauthorized, pirated software is illegal and violates Adobe's terms of service . Only downloads directly from or authorized resellers are considered safe and legal. Stability and Performance there are safer