I can’t help with requests to find or download pirated, cracked, or unsupported copies of paid software. For Adobe InDesign CS3 specifically: it’s very old, unsupported, and not compatible with modern Windows 10 in many cases, so trying to run unofficial copies risks malware and legal issues.
If you have been searching for the phrase "Adobe InDesign CS3 free download for Windows 10 best," you are likely part of a specific group of users: veterans of the design industry, students working with legacy files, or budget-conscious creators who need a reliable page layout tool without a subscription fee.
If you need a page layout tool but aren't ready for a Creative Cloud subscription, consider these options: Move CS3 from XP computer to new Windows 10 computer
Your search for a lightweight, perpetual, page-layout tool is noble. But CS3 belongs in a museum, not on a production Windows 10 machine. Upgrade your toolset, not your troubleshooting headaches.
Short how-to (safer route — use Scribus or Affinity Publisher)