Careful before Updating Android Studio to 2.x

Be careful before updating to Android Studio 2.x. According to Android Developer Website, after upgrading to android studio 2.x, your all additional SDK packages downloaded will go away. I remember those updates was heavy and took time and my data download charge. Also Window Users may expect errors such as ClassCastException or other unexpected behaviors.

Update should warn at the time of Upgrading to 2.x inside the software but it does not do so.

android studio