Can't install latest AVG on Windows XP x64 SP2

Can't install latest AVG Free on Windows XP x64 SP2. When i'm trying, it says "OS is not compatible".
But old AVG Free 2015 still works fine.
P.S.
SP2 for WinXP 64-bit was released in 05/06/2008 (its even newer than SP3 for 32-bit).
SP3 for WinXP 32-bit was released in 04/21/2008.
SP2 for WinXP 32-bit was released in 09/06/2004 (!!!) (XP 64-bit was released in 04/25/2005)
So, WinXP x64 with SP2 and WinXP 32-bit SP2 are NOT the same thing.
I don't understand why Windows XP x64 is unsupported.
I was thinking of buying Internet Security for a year, but I can't install a trial 30-days version.

Hi Andrew,

We understand your concern, we would like to inform you that AVG can be installed on Windows XP Service Pack 3 and higher. We request you to upgrade your Operating System to install AVG Anti Virus FREE. Thank you for understanding!

Thank you!

Andrew, Please read the AVG article in my 1st posting again!!
AVG Guru

OK Andrew, But just bear in mind that AVG 2015 may not be updated much longer (https://support.avg.com/SupportArticleView?l=en&urlName=End-of-support-of-old-AVG-products).
AVG Guru

Ok. I guess I have to use AVG 2015. Because i'm not going to upgrade my OS. My PC is not old, but most of my devices not support Vista or 10.

Andrew, Just have a look @ this AVG article (http://avgread.me/1Ewajhi).
AVG Guru

Windows XP x64 don't need SP3. SP2 for Windows XP x64 has all fixes from SP3 for XP 32-bit, and even more. SP2 for Windows XP was released in 2008.

SO Windows XP SP3 32-bit even more outdated OS than XP x64 SP2.
Also XP x64 has been supported until July, 2015, just like Server 2k3. All updates for Server 2k3 x64 and XP x64 are same.

Hi Andrew,

We understand your concern, we would like to inform you that AVG can be installed on Windows XP Service Pack 3 and higher. We request you to upgrade your Operating System to install AVG Anti Virus FREE. Thank you for understanding!

Thank you!