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I am unable to renew my developer account because my Mac Book Air is Mavericks and for various reasons is not able to update to a later operating system. I've tried loading Sierra onto a USB drive but it won't run from that.It says I need "two-factor authentication". Which seems to be impossible for Mavericks. (It won't even allow "two-step" authentication)This means all my apps have been taken down. I just need to log in to my account to update the developer account and pay my yearly fee.I want to give apple my money but it is making it very difficult! Is there any work around? 😕(I read somewhere there is a work-around for earlier OS which involves typing the authenication code after the password but I couldn't get that to work.)