The link is the first listed under the CS4 section on this page:
It is titled:
Download the Adobe Flash Player 10 Update for Windows and Macintosh (ZIP, 44.5MB)
Are these security fixes no longer provided?
Only Adobe staff can answer your question; most likely someone will address this after the weekend is over.
I've forwarded the page with the broken link to our documentation folks so they can update it. For Flash Player 10, we recommend you update to the latest version for all available security updates.