Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.
I want to downgrade my ArcGIS 10.2 to 10.1 hoping it would be less slow and buggy but I just won't afford to have any toolsets missing in the 10.1
You'll need to look at the What's new in 10.2 document. The items listed in here will not exist in the previous, 10.1 version.
Required, but never shown