When you run Set-up.exe , you get: "Setup initialization has failed. Please quit and retry (Error 131)."
Use Google search: site:reddit.com "Illustrator CS5" "Google Drive" after:2024-01-01 Sort by "New." The best subreddits are r/AdobeZii (Mac) and r/GenP (Windows). Do not ask for direct links (rule violation), but search their "Megathread." Adobe Illustrator Cs5 Free Download Google Drive Fix
: Temporarily disable your antivirus or check your browser's "Downloads" bar to manually "Keep" or "Allow" the file if it was flagged. Critical Risks of Unofficial Downloads When you run Set-up