I upgraded from 2022 to 2023 but activation doesn't work.

Hello, I got an email from my classmate for college student organization that can upgrade my SolidWorks from 2022 to 2023 and once it started installing, I chose the option to upgrade from 2022 to 2023 instead of keeping the old one and having 2 SolidWorks versions. Everything went smoothly and I finished installing but once I opened it, it said to active my license and I forgot what I did but basically my grace period went to 0 days and it gives me this error " 

Activation transaction failed: Serial number not entitled to SOLIDWORKS 2023. Check that you have entered the correct serial number. For further support, contact your support representative. (3/0)

I don't know how to put my serial number if all I see when I open SolidWorks is to activate it and I don't see an option to put the serial number.

Edu ​​​​​​​