My Revit 2021 Sudden Won't Start Up

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I am a student 3rd year college student, and I have been using a student version of Revit 2021 with no problems at all until yesterday. I tried to start it up before class but now I get this error message:
"The License Manager is not functioning or is improperly installed. Revit will now shut down".
I hit the link "Help Me Understand", and I get this message:
"Based on the Autodesk ID you used to log in, it looks like you’ve been running the trial version of this application, and the time limit is up".
I have been using a student version. I log on the my AutoDesk account, and it tell me: "Your educational access to Autodesk products is valid through August 24, 2021. Choose a product below".
I have tried every suggestion from this link: https://knowledge.autodesk.com/support/autocad/troubleshooting/caas/sfdcarticles/sfdcarticles/Error-... as well as tried uninstalling, and reinstalling, and every YouTube remedy, but to no avail, still getting the error message: "The License Manager is not functioning or is improperly installed. Revit will now shut down".
HELP! Thank you.