Hey , how i can fix this? i was downloading my new license and than i downloaded it and i tried to open unity to load it , but it keeps telling me the same always.What is the problem? How can i fix it? Please help me! 
If you’re having license issues then email Unity’s support folks, it may need something done on their end before it’ll work for you.
Just Set the current date and time on computer.
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Cool!
yes date and time …
thank you
what date and time?
what Just Set the current date and time on computer.