I had this exact issue. Downloaded the combo update for 10.6.8 and the App Store update but nothing worked. Finally determined that the issue was with my network as I had upgraded my wireless network from DSL to fiber optic. Click on the top menu bar on the wireless icon and go to your Open Network Preferences, go to the Advanced tab, and then select the TCP/IP tab. Go to Configure IPv6 and turn it from 'Automatically' to 'Off.' Snow Leopard does not work properly with these wireless settings as the newer Mac OS versions.
You may have to restart your router/modem, but once you go back to Safari and App Store, they should be working normally. Apple Footer. This site contains user submitted content, comments and opinions and is for informational purposes only. Apple may provide or recommend responses as a possible solution based on the information provided; every potential issue may involve several factors not detailed in the conversations captured in an electronic forum and Apple can therefore provide no guarantee as to the efficacy of any proposed solutions on the community forums. Apple disclaims any and all liability for the acts, omissions and conduct of any third parties in connection with or related to your use of the site. All postings and use of the content on this site are subject to the.
Best Answer: Hi Rebecca, You may not still need this, but I spent hours and hours trying to figure this out. Here's the answer: 1) Open the App Store (if you don't see it, type in 'App Store' using Search from top right hand corner) 2) Navigate to Categories from tool bar at top (in the middle, next to Top Charts and Purchased) 3) Now look in top right corner of App Store window and under Quick Links you will see Redeem (this text is gray and hard to see) 4) Click on Redeem 5) Enter code Hope this help anybody else from wasting as much time as I wasted on this. Answered by Colby L from Piedmont. Apr 13, 2016.
About the Mac OS X v10.6.8 Update. Enhancements to the Mac App Store to get your Mac ready to upgrade to Mac OS X Lion. 
 Resolves an issue that may cause Preview to unexpectedly quit. More ways to shop: Visit an Apple Store, call 1-800-MY-APPLE, or find a reseller. I deleted the App Store application with AppCleaner some months ago, after ongoing problems with a freezing Finder. Now I would like to reinstall, but I cannot find a way. The 10.6.6 combo updater of course will not do the job because it needs an older OS X incarnation and I'm running 10.6.8.