There are two methods for install Mavericks 
1. Install Mavericks on empty volume
This is the easy way that you can use for install Mavericks without keeping any backups of previous Mac OS X version. You do not need any backup because you have an empty volume to install the OS. The main advantage of this method is you can install Mavericks download with exiting startup drive while it is booting. Also, this method doesn't need much time to complete the installation process.
'I can't download an old version of Mac OS X' If you have a newer Mac, there is no physical option to install Mac OS versions older than your current Mac model. For instance, if your MacBook was released in 2014, don't expect it to run any OS released prior of that time, because older Apple OS versions simply do not include hardware. Download Mac OS X Mavericks 10.9.5 free latest version offline setup for MacBook. Mac OS X Mavericks 10.9.5 is a powerful operating system with a variety of enhancements and a variety of new features that delivers more stability and ultimate level of performance.
OnyX is a multifunction utility that you can use to verify the structure of the system files, to run miscellaneous maintenance and cleaning tasks, to configure parameters in the Finder, Dock, Safari, and some Apple applications, to delete caches, to remove certain problematic folders and files, to rebuild various databases and indexes, and more. OS X 10.11 El Capitan, following on from Mavericks and Yosemite, is to be offered as a free upgrade for existing Mac users of any OS X version from 10.6.7 Snow Leopard onwards. MacOS 10.12 Sierra The first version of OS X now titled as macOS, Sierra is a free upgrade to existing Mac users of any version of the operating system since 2010's OS.
2. Install Mavericks on the startup volume
When you are using this method to install the Mavericks download, please keep a backup of your previous OS file and application data. Otherwise, you do not be able to use those applications and file after the installation of the new OS X version. You need to create a bootable USB installer which has the Mavericks installer software on it.
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- The Cupertino-based company showed off more of Mavericks, the latest incarnation of Mac OS X. Better yet, Apple announced that Mac OS X Mavericks will be available as a free download immediately.
- Apple has released OS X 10.9 Mavericks, and somewhat surprisingly it is a free upgrade for all existing OS X users. If you're using a Mac laptop or desktop from the last five years or so, you should be able to download OS X Mavericks for free just by visiting the Mac App Store.
- Before you upgrade, we recommend that you back up your Mac. If your Mac is running OS X Mavericks 10.9 or later, you can upgrade directly to macOS Big Sur. You'll need the following: OS X 10.9 or later; 4GB of memory; 35.5GB available storage on macOS Sierra or later. Some features require an Apple ID; terms apply.