Cant download AVG on imac

Hello Amy,
I apologize for the inconvenience caused. I just verified your records with us and I would like to keep you informed that your product "AVG Internet Security (1 computer)" purchased in October 2015 will be compatible only with 'Windows' computer/laptop. I suggest you to use the license number in any 'windows' computer/laptop. If you do not wish to use the license, then you can contact our 'refund' team to request 'refund'. To request 'refund' please click on https://support.avg.com/support_sales?l=en_US [Scroll down and click on 'Request a Refund']. Our refund team will check the detaisl of your product and will contact you via email. For more information on AVG products for 'Mac' devices, have a look at http://www.avg.com/us-en/for-mac .Please feel free to contact us back for any further assistance. Thank you.

I purchased this AVG Internet Security 1 year for $69.99 back in October and ever since  I cant download this product on my imac PC. it says " you cant open the application because MS window app are not supported on OSX". Im not a wiz with computers, if anyone knows how to fix this (with instruction) Ill be grateful otherwise ill have to get refund. Thanks
Hello Amy,
I apologize for the inconvenience caused. I just verified your records with us and I would like to keep you informed that your product "AVG Internet Security (1 computer)" purchased in October 2015 will be compatible only with 'Windows' computer/laptop. I suggest you to use the license number in any 'windows' computer/laptop. If you do not wish to use the license, then you can contact our 'refund' team to request 'refund'. To request 'refund' please click on https://support.avg.com/support_sales?l=en_US [Scroll down and click on 'Request a Refund']. Our refund team will check the detaisl of your product and will contact you via email. For more information on AVG products for 'Mac' devices, have a look at http://www.avg.com/us-en/for-mac .Please feel free to contact us back for any further assistance. Thank you.
Amy, Also you'll be pleased to know that AVG Mac OS products are free.
AVG Guru