While it may be tempting to search for free Adobe Illustrator CS4 serial numbers online, it's essential to understand the risks involved. Here are some of the potential consequences:
lost serial number to prove ownership or for record-keeping: How to Find Adobe CS4 Serial Number on New Computer - FAQ
This was the version that finally introduced the ability to work on up to 100 artboards of varying sizes in a single document. It revolutionized the way designers handled multi-page layouts and brand identity packages.