When the Apple logo reappears on your MacBook Air’s display, press and hold down ‘Command + R‘ on your keyboard. Don’t let go until you see the macOS Utilities window appear on your display If you want to reinstall macOS over your current file system, click Reinstall macOS. Download Bitmoji and enjoy it on your iPhone, iPad, and iPod touch. ‎Bitmoji is your own personal emoji. Create an expressive cartoon avatar. Choose from a huge library of stickers – all featuring YOU. Use Bitmoji in Snapchat and wherever else you chat Using Bitmoji in Snapchat unlocks Friendmoji – 2-person Bitmojis featuring. Macbook Air free download - Air Warrior II demo, Kies Air, South Park Ultra Air Hockey, and many more programs. Tools & Utilities. MOST POPULAR APPS. Your MacBook Air comes with apps for everything you want to do. Edit and share your photos. Enjoy music, books, movies, and more. Create presentations. And discover new apps in the App Store, including iPhone and iPad apps that now run on MacBook Air. Learn about apps included with your Mac.

It sounds like the download may not have failed but the installation did so the only thing left that your MBP can boot from is the Recovery partition (see this discussion). Since you don't want to loose all your documents and you don't have a backup to restore from, I can think of a few things to try.

Reboot and hold down the option key to see what the MBP sees as bootable. If it's just the Recovery partition, that's where you are.

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If there's a second choice (e.g., Macintosh HD), and it doesn't boot from that, try to reboot and hold down the shift key to start in Safe Mode.

Getting more extreme would be to get an external drive and Reinstall OS X on it so that you can boot from it and copy over your documents from the internal drive using Setup Assistant.

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FInally, you could reinstall OS X on the internal. That should get Mountain Lion working again without damaging the rest of your files.

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More About Glary Utilities for Mac

Glary Utilities is a useful system software that can perform maintenance on Windows. This application provides an array of tools to improve computer performance by removing junk files, re-arranging cluttered registry and optimizing start-up programs. Glary Utilities is equipped with 5 different modules, namely:

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Unfortunately, Glary Utilities only supports Windows, that is Windows 8, Windows 7, Windows Vista and Windows XP. Mac OS X is not in the list. If you're searching for a program that is similar to Glary Utilities but runs on Mac, MacBooster is the best Glary Utilities for Mac alternative. It's the most closest operating system tool with almost identical features. Mac OS X 10.5 or later is supported, including 10.9 Mavericks, 10.8 Mountain Lion, 10.7 Lion, etc.

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