I have obtained the free student license
Why does it expire ?
What should i do now ?
Please refer to this post regarding renewal of the license.
Product as in the free trials ?
Yes, Product = Free ANSYS Student
This one ?
Yes. That has an updated license included with the installation.
So do i uninstall 2019 R3 ?
No, you don't need to. You can if you don't intend to continue using 2019R3. Did you want to just update the license or run the new version? To update the license and continue running 2019R3 you follow the instructions in the link I provided. To use the new version, you can just download it and install it, you can then run it just as you have been running 2019R3.
Ansys customers with active commercial software licenses can access the
customer portal and submit support questions. You will need your active account number to register.