Problem upgrading

When I try to upgrade, I get the message that the new version is incompatible with the current version.  The install date of the last version was Nov 29th of last year.

Hello Clarence,
Sorry to know that you have issues in upgrading to latest version.
Please try uninstall all the traces of AVG using AVG remover tool through this link http://aa-download.avg.com/filedir/util/AVG_Remover.exe
Please start with a fresh installation of your AVG Internet Security unlimited through the below link.
http://files-download.avg.com/inst/mp/AVG_Protection_806.exe
Please feel free to contact us for any further assistance.
Thank you.

Hello Clarence,
Sorry to know that you have issues in upgrading to latest version.
Please try uninstall all the traces of AVG using AVG remover tool through this link http://aa-download.avg.com/filedir/util/AVG_Remover.exe
Please start with a fresh installation of your AVG Internet Security unlimited through the below link.
http://files-download.avg.com/inst/mp/AVG_Protection_806.exe
Please feel free to contact us for any further assistance.
Thank you.