Mountain lion will not download from the app store. what do I do?

Please help. Purchaced mountain lion upgrade. shows up app store under purchased.  click on download. Nothing happens....My iMac meets all system requirements. Stuck in appland.  Also, I have heard bad things about mountain lion. should I even install? Or can I bypass and go to OS X Mavericks? Confused & afraid now...

If you meet these requirements you can upgrade directly to Mavericks: OS X Mavericks: System Requirements. However, before upgrading I would check the compatability of your 3rd party application at RoaringApps - Application compatibility and feature support for OS X and iOS.
If you're having problems with the App Store you might try this:
1 - enable the Debug menu in App Store:
open the Terminal application.
copy the command below and paste into the Terminal window:
defaults write com.apple.appstore ShowDebugMenu -bool true
followed by Enter.
launch App Store, login.
2 - select the Debug ➙ Reset Application option:
3 - try again.
OT

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