Illustrator requires a serial number

For the serial number issue you can follow the instructions given in the article linked below

https://helpx.adobe.com/download-install/kb/troubleshoot-creative-cloud-serial-number.html

-Manan

What plan do you see when you log onto your account on the web https://account.adobe.com/plans

If you see the plan listed and still it shows as a trial on your computer then you can check out the following article

https://helpx.adobe.com/hk_en/manage-account/kb/stop-creative-cloud-trial-mode-after-purchase.html

-Manan

are you installing an old version of illustrator?

do you have a current subscription?

Exactly how did you install what?

Here's how to install: https://helpx.adobe.com/download-install/kb/install-app.html 

hi dear,

as I have an old free membership in Adobe and as a contributor designer.

Please be informed that I have replaced a new laptop instead of the old one that was unusable for graphic design.

I have downloaded the Creative Cloud with my previous ID and 4 applications, but when I downloaded Illustrator, I couldn't run it; it requires a serial number or says { it works on this device}.

huda Hashim

A contributor designer

Yemen