While installing Exchange 2010 SP1, setup readiness checker will show you the required missing hot fixes, and will also provide you the links to download these missing hot fixes, but at the moment when you will try to open those links, provided by the Exchange 2010 SP1 setup, will show you the errors on MS site.
Solution:
While today I was finding these hot fixes (all from one location), so I found a good article of Rajith, where he uploaded all the bunch of required hot fixes on his SkyDrive, so I thought to share it with you for saving your time and efforts.
Download the hot fixes from the below “Download Here” link.
Cheers!
Zahir Hussain Shah
Azure Hybrid & Cloud Migration Blog 
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