The Download Stagnation Vector
When you attempt to download a massive software update or purchase a new application from the Mac App Store, the process relies on a complex background caching system. Occasionally, if your network drops during a download or if the Apple servers experience a glitch, this cache becomes corrupted. When this occurs, the App Store will stubbornly display a spinning wheel, freeze at “Waiting…”, or simply refuse to initiate new downloads, no matter how many times you restart the application.
How to Clear the App Store Cache
You cannot clear this corruption using the graphical interface. You must use the Terminal to aggressively locate the temporary directory and obliterate the stalled cache files.
1. Quit the App Store completely (press Command + Q while the app is active).
2. Open the Terminal application (found in Applications > Utilities, or via Spotlight).
3. To instruct the operating system to reveal the exact, randomized directory path where it is storing your specific cache files, execute the following command:
open $TMPDIR../C/com.apple.appstore/
4. Press Enter. The Terminal will instantly command the Finder to open a hidden system folder.
5. Inside this folder, you will see several items, including a folder named com.apple.appstore or simply loose cache files. Select every single file and folder within this window.
6. Drag all the selected items directly into the Trash.
7. Empty the Trash immediately to ensure the corrupted data is destroyed.
Relaunch the Mac App Store. The application will be forced to rebuild its cache from scratch and establish a fresh connection to the Apple servers, allowing your stalled downloads to finally proceed.