Avast 5.x manual updates installs v.6 on Windows 2000

Avast Free Antivirus / Premium Security
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Routine update software on systems, Avast 5.x on Windows 2000 downloaded and installed version 6. So, which is it Windows 2000 is supported or not?

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To run avast! Antivirus v6 your PC must meet the following criteria.
Operating Systems Supported

* Windows 7
* Windows Vista (any Edition excl. Starter Edition)
* Windows XP (Service Pack 2 or higher)
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https://support.avast.com/index.php?_m=knowledgebase&_a=viewarticle&kbarticleid=750#idt_01

What are the supported operating systems for avast! 6.x ?

The supported operating systems for avast! Internet Security 6.x are Microsoft Windows XP Service Pack 2 or higher (any Edition, 32-bit or 64-bit), Microsoft Windows Vista (any Edition, 32-bit or 64-bit) or Microsoft Windows 7 (any Edition, 32-bit or 64-bit).

The supported operating systems for avast! Pro Antivirus 6.x and avast! Free Antivirus 6.x are Microsoft Windows 2000 Professional Service Pack 4, Microsoft Windows XP Service Pack 2 or higher (any Edition, 32-bit or 64-bit), Microsoft Windows Vista (any Edition, 32-bit or 64-bit) or Microsoft Windows 7 (any Edition, 32-bit or 64-bit).

Free AV / Pro AV still support Windows 2000.

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So it is!!! ;D
I use the Free with Windows 2000 Pro.