Why can't I activate Illustrator when I insert my old Adobe CS3 serial number?

I'm new in Adobe Creative Cloud efter the trial has ended...Now I can't open the programs due to my serial number is rejected...

Just to confirm , may I ask whether you had purchased subscription for Creative Cloud and the apps are asking for serial number?
Also specify operating system whether it is Windows or Mac ?
You cannot use CS 3 serial number for CC versions.
Creative Cloud application ask for serial number for different reason like :
1) Invalid Sign in to Creative Cloud and it may need to refresh sign in by Signing out and Signing in again to Creative Cloud app.
2) Adobe blocker Entiries in Hosts file which will be blocking Activation process.
3)Corrupt opm.db file or other related files or sometimes even Creative Cloud app itself. ..etc
4)Network related issue like Proxies, restricted or corporate network issue, Firewall..etc

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