Apple finally released the public beta version of testing of OS X Yosemite for Mac computers. In order to download and proceed with the installation, you should enroll to the “OS X Beta Seed Program” .
Apple also provided an update for Mac on OS X 10.9 Mavericks. Before proceeding with the update, we recommend that you backup you mac in case something goes wrong since the first beta version is note stable, but fully operational with features of the final version of Yosemite. At the same time, it is not guarantee that this beta version will be error free.
Download and install OS X Yosemite beta:
Step 1: Open the Safari and type appleseed.apple.com / sp / betaprogram.
Step 2: If you have not yet registered in “OS X Beta Seed Program”, sign up to gain access
Step 3: After signing in with your Apple ID, scroll down and click the “Get OS X Yosemite Beta Redemption Code”
Step 4: On the next page you will be asked to make sure that your Mac supports OS X Yosemite. click on “I have read the above and understand the limitations of using this beta software” . Then Download OS X Yosemite Beta.
Step 5: After clicking Download Yosemite Beta launches from the Mac App Store, enter the code for loading the operating system. Enter the code and confirm the download and installation of OS X Yosemite.