As you know, Apple released the Developers Preview of a new OS that will arrive this summer.
First of all, you need to be sure you want to test it out. There are not many reasons why someone with a bit of common sense will want to do this, given that the system is highly unstable. But as we know you won’t listen to what we say, the only thing we hope -for your own sake- is that you will do it the Right Way.
Second thing is that you HAVE to know this won’t “work on AMD”, won’t “work on ayfonfor” and probably it won’t work on hackintosh. Or maybe it will… If you find out, let us know!
OS X Mountain Lion requires a Mac with a 64-bit kernel. Mountain Lion supports the following Mac models:
• iMac (mid 2007 or later)
• MacBook (13-inch Aluminum, 2008), (13-inch, Early 2009 or later)
• MacBook Pro (13-inch, Mid-2009 or later), (15-inch, 2.4/2.2 GHz), (17-inch, Late 2007 or later)
• MacBook Air (Late 2008 or later)
• Mac Mini (Early 2009 or later)
• Mac Pro (Early 2008 or later)
• Xserve (Early 2009)
Now that we have it all clear and we still want to give it a try ON OUR COMPATIBLE SYSTEMS we can proceed:
Step 1:
Download Mountain Lion DP1 from here or wherever you like.
Step 2:
Make sure you have enough space on your hard drive and create a NEW PARTITION formatted as Mac OS X Extended (Journaled). We will use this as TARGET PARTITION.
Step 3:
Mount Mountain Lion DP1 and proceed with the installation. When you have to select the targetdisk/partition, click on “show all” and select the partition you created at step 2. Will install for several minutes (around six) then it will restart.
Step 4:
When restarting the installation will continue for about half an hour. Wait… And wait… 
Step 5:
You now have Mountain Lion on a separate partition and you won’t lose your files, configuration, applications. Feel free to play with it as much as you want.
VIDEO GUIDE:
Things that work:
-Mail
-Notes
-iCloud
-FaceTime
-iMessages
-Safari
-Skype
-Notifications
-Bluetooth
-Wi-Fi
-Probably all the others.
There’s also a little change that I particularly like. Many users gave their feedback to Apple letting them know how unhappy they are with “Reopen windows when logging back in” being checked by default. Seems that Apple listened and now the option is checked but keeps the state you select.
Karmic Alice
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