Websites offering "free" or "cracked" versions of Illustrator CS6 are often fronts for malicious activity: Adobe Help Center Creative Suite 6 system requirements - Adobe Help Center
If you're unable to find a reliable download source or prefer a more modern version, consider these alternatives: Adobe Illustrator CS6 WORK Download Free
If you previously purchased Illustrator CS6, you are legally entitled to download the installer. Here is how to do it safely: your bank account
Instead of risking your computer for a dead 12-year-old program, consider these alternatives that open and edit Adobe Illustrator files: Adobe Illustrator CS6 WORK Download Free
Do not risk your identity, your bank account, or your computer for a 12-year-old piece of software that Adobe has abandoned. The vectors aren't worth the virus.