Hello, Nancy.
I regret for any inconvenience this may have caused. May I know what is the exact issue that you are experiencing when trying to install AVG TuneUp - Unlimited? Please make sure that you uninstall the earlier version of AVG PC TuneUp program before trying to install the new subscription.
Click on this link for steps to uninstall AVG PC TuneUp.
Then refer to steps in this link on how to download and install AVG TuneUp - Unlimited.