OS X Yosemite - iTune : Unable update to iTune 12.0.1

OS X Yosemite - iTune : Unable update to iTune 12.0.1

1. When you try to click "UPDATE" or "UPDATE ALL", it's never update or install.

2. When you open iTune and goto iTunes > About iTunes, it's show your current version not update too 12.0.1.

3. Try install manual by download here: http://www.apple.com/itunes/download/

4. Double-click on "iTune12.0.1.dmg" then double-click "Install iTunes.pkg" and follow from their instruction.

5. After installed, let's check goto iTunes > About iTunes, now your iTune update to 12.0.1.

6. Check your "App Store", now update notification was gone. It's work!