I purchased the upgrade from free last month when it was on sale for 37.50,

Hello Ida,
I'm sorry to hear that you're experiencing issue with AVG Internet Security activation. Yes, I see that you have purchased AVG Internet Security - Unlimited (1 year subscription) expires: 2018.5.30 and AVG PC TuneUp (1 computer) expires 2017.8.19. I have sent you an email, please follow the email instruction to activate AVG Internet Security- unlimited.
Best regards,
Alok.

I purchased the upgrade last month when it was on sale. I downloaded etc, but did not receive a key code to activate it.  Your site still keeps asking me to upgrade to that paid version.  I did, I paid, but there's no change.

Hello Ida,
I'm sorry to hear that you're experiencing issue with AVG Internet Security activation. Yes, I see that you have purchased AVG Internet Security - Unlimited (1 year subscription) expires: 2018.5.30 and AVG PC TuneUp (1 computer) expires 2017.8.19. I have sent you an email, please follow the email instruction to activate AVG Internet Security- unlimited.
Best regards,
Alok.