Issues Validating Serial # for CS6 License

I recently re-installed CS6 onto my macbook pro. I am trying to validate my license & keep encountering errors. The first issue I had was that I kept receiving an error saying the computer was not online. I tried to do the validation offline which continusouly kept giving me a notice that my serial # was expired or invalid. I contacted adobe support who said there were no issues with my serial #. I removed the programs & reinstalled. Now when I open a program I am prompted to either do a 30 day trial or login to validate my license. When I try to login to validate my license I am sent in a continuous loop. I input my account login information, it asks me to verify, I enter the verifiation code, & then am sent back to the login screen. This happens until I eventually recieve an error message saying that my account is temporarily disabled due to security issues. I've had my account unlocked by adobe support but still no luck validating or loging in. I am running Mojave 10.14.6, so the operating system is not the issue. I am also able to login on the adobe website no problem & my CS6 is not in use by any devices currently. Any help would be greatly appreciated!

Yes, I understand that this is the 'older version'. Unfourtunately I spent thousands of dollars to own the rights to the license & I do not like the new version of illustrator. So I would like to continue use of the program that I have already spent a copious amount of money on & am comfortable/familiar in using.