Ensure you aren't trying to use a serial number from an older "Creative Suite" (CS) version on a "Creative Cloud" (CC) application. Risks of Using "Fixed" or "Hot" Serial Numbers
In highly secure, permanently offline settings (like government or banking), a serial number and request code may be used for an "Offline Activation" process. Where to Find a Legal Serial Number adobe illustrator cc 2015 serial number fixed hot
If you are entitled to a serial number (e.g., through an older volume license or purchase), here is where it would be: Ensure you aren't trying to use a serial
How can I enter my license key in adobe illustrator cc 2015? Beginning with the CC era in 2013, Adobe
Beginning with the CC era in 2013, Adobe transitioned from perpetual licenses (which used 24-digit serial numbers) to a .
Only certain Enterprise (ETLA) customers still use serial numbers for deployment.