Student license - License error


I've created and downloaded all the student products which have been received via email. But after installed, I can't use it (I have already set the environment for the license). Could you please help me this problem.
Answers
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You can remove the environment variable and place the license file directly in the security folder,
Use windows folder options > unhide known extensions, to make sure the file is named altair_lic.dat and not altair_lic.dat.dat,
You need to confirm if the Ethernet address in the license file is the correct one and matches the one in your machine.
When you open the license file in a text editor you will see an Ethernet address there in a line that says 'ETHERNET =
The Ethernet ID is the ID of your machine which is exactly 12 hexadecimal numbers. For example D4WRF478F398
Run ipconfig/all in command window and check for physical address under Ethernet adapter local area connection:
<?xml version="1.0" encoding="UTF-8"?>
The listed physical address under Ethernet adapter local area connection should be used to generate the license file, if there is no listing of Ethernet adapter local area connection, the address under Wireless Adapter LAN Wifi must be used.
That means if the address provided as above does not match the one in the license file, please request for the license file again with the correct Ethernet ID.
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Dear Altair Community,
I have a problem with the license file and would appreciate your help. First, I would like to inform you that it is many times, I asked for a new license file. Is there any other way to overcome the licensing problem with the student edition? Some of the times, it took two days to receive the new license file, and it is a long time for the user!
Attached, please find the screenshot of the error I received. Please advise me on this issue.
Kind regards,
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