Unable to renew developer account so all apps disabled.

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.)