Acrobat Reader Sign in - Update Required Error

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We have recently upgraded to Acrobat Reader 21.005.20060 in our environment. And we started seeing the error "Update Required: 

Your browser or operating system is no longer supported. You may need to install the latest updates to your operating system." when we try to sign in. We are currently on IE 11 and Windows 10 version 1909. We have tried to apply the registries as suggested in https://helpx.adobe.com/x-productkb/global/update-operating-system-and-browser.html?internal_browser... with no success. Also I wanted to try the steps suggested in https://community.adobe.com/t5/acrobat/update-your-os-or-browser-while-signing-into-acrobat-error/m-... but I dont see the OOBE folder under C:\Program Files (x86)\Common Files\Adobe to copy the AASIapp.exe. This has affected many users in the environment. Any help would be appreciated. Thank you in advance.