Getting Adobe InDesign CS3 to run on Windows 10 is difficult because Adobe has for this version. Even if you have the original installation files, the software may not activate or function correctly on modern operating systems. Official Adobe Options
Many sites offering "free downloads" of CS3 may bundle malware, as the software is no longer provided through the Adobe official website Activation Issues: adobe indesign cs3 free download for windows 10 best
: Adobe does not authorize the free distribution of its legacy software. Top Modern (and Free) Alternatives If you need the power of InDesign without the Creative Cloud subscription Getting Adobe InDesign CS3 to run on Windows