Downloaded and installed antivirus for mac but unable to get it to open

Mac products
1

I have downloaded and installed antivirus on my mac and it won't open.  My purchase number is 107-3568691

4

Johnson, AVG AntiVirus for Mac is free (http://www.avg.com/ww-en/for-mac).
AVG Guru

2

Johnson,
We are sorry for the inconvenience caused. Could you let us know the version of Mac and the error message if you receive any while trying to open AVG to assist you further?

3

Johnson, AVG AntiVirus for Mac is free (http://www.avg.com/ww-en/for-mac).
AVG Guru