I'm trying to reinstall CS3 on new computer.

When I go to download from Adobe (https://helpx.adobe.com/creative-suite/kb/cs3-product-downloads.html), I get HTTP ERROR: 404.  Help.

use a different browser and/or clear your adobe.com cookies or
if you follow all 7 steps you can directly download a trial here:  Download Adobe CS4 and CS3 Free Trials Here (incl. After Effects) | ProDesignTools
and activate with your serial number.
if you have a problem starting the download, you didn't follow all 7 steps, or your browser does not accept cookies. 
the most common problem is caused by failing to meticulously follow steps 1,2 and/or 3 (which adds a cookie to your system enabling you to download the correct version from adobe.com). 
failure to obtain that cookie results in an error page being displayed after clicking a link on prodesigntools.com or initiates the download of an incorrect (eg, current) version.

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