Warning message expire license of Ansys 2021 R1 l License renewal is not working

Hello. I downloaded Ansys 2021 R1 about weeks ago and I faced a frequent message warning about expire license: The license for one or more ANSYS product will expire in xx day(s)! Please contact your ANSYS Sales Representative or ANSYS, Inc. So, I downloaded Ansys 2020 R2 to get a student.lic file and copy the file to licensing folder of installed Ansys2021 R1 in my pc. However, it is not working, the message is continue popping up. I have only 10 days now. What should I do? Please help.

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