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Thank you mate !! I solved it with a previous version, what is perfect for me. Thanks for your time !
Okay, I solved the problem from your questions. I am a beginner and I just realized I am able to use an older version. What is working perfectly....
Cannot perform upm operation: Unable to add package [com.unity.cinemachine@2.6.0]: Request [POST https://api.unity.com/v1/oauth2/authorize]...