Reinstalling AVG

I purchased AVG in September 2016, one computer, 2 years.
I took it off my computer but now want to reinstall it.  It states my free trial is over and I have to purchase.

Where can i plug in my license code so that I don't have to repurchase?

Hello David,

We are sorry for the inconvenience caused.
The installed AVG program on your PC says as "AVG ZEN" ?

Hello David,

We are sorry for the inconvenience caused.
The installed AVG program on your PC says as "AVG ZEN" ?