Update: It does not work on Win 2K after all, so if you just wish to download (but not install) then you could use this article.
Update 2: It can be made to work using this.
Though Google Chrome runs on
Win 2K SP4 Win XP SP2 and above, the download link only allows XP and Vista users to download. To download on a Win 2K system, you would need to change the user-agent of the browser.
On Firefox, go to about:config, create a new string entry general.useragent.override and set it to this (or something similar).
Mozilla/5.0 (Windows; U; Windows NT 6.0; ru; rv:126.96.36.199) Gecko/2008070208 Firefox/3.0.1