Payed for AVG Internet Security

Hi, - I just downloaded the free AVG Antivirus for Mac today, - ran a full scan, - and when trying to remove threats, - it took Me to your website, and asked Me to pay for AVG Internet Security, - which i did with a 2 year subscription! - But then it asked Me to download a Windows program???
Have I payed for something that is not for my Mac? - In that case, I expect to have my money returned.

OK, I will, and expect to get a refund. - thanx