Hot answers tagged mac-appstore
Go to System Preferences > App Store > Change... (next to "Your computer is set to receive pre-release Software Update seeds") > Do Not Show Pre-release Updates
Check this Apple page for screenshots. Open the App Store Preference Pane: Go to the Apple Menu () and select System Preferences. Select the App Store icon from the list of Preferences icons. Disable Pre-Release Updates: Click the "Change…" button next to "Your computer is set up to receive pre-release Software Update seeds." Confirm Your Change. A dialog ...
Open the App Store app and go to Store → Sign Out.
You do not have to Install Yosemite. In your case just open the Applications folder navigate to the "Install OS X Yosemite.app" and Delete it.
Considering there are million of apps that have In App Purchases (IAPs) then yes.
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