Build 453 was likely the last version of Sony VP13 - as the link explains, Sony no longer has legacy DLs on their servers. The links given are from 3rd party websites and therefore the usual cautions should be taken.
If I reinstall my disc, how will I get the old updates for 13?
Next time you need to do this, go to your Magix account and download it from there. It is always the latest build.
Actually, that is what I ended up doing. I found it before anyone responded and had the download waiting until I heard a response. Thanks to all for their quick responses though..