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Stick with 4.9 if your project needs source access

Unreal Engine 4.10 is not ready for production use when using the source code. You’ll need to stick with 4.9 and Visual Studio 2013 if you require source access.

There are 2 major issues with it right now, the first is if by some miracle you are able to even generate the project files needed to open it and get it to build, you will be unable to package your project or build lighting (I’m sure there are other issues as well).

The main issue you’ll probably run into is not being able to generate your project files, currently there is no known fix and you’ll be out of luck if you run into this.

Definitely best avoided on production machines, stick with 4.9/VS2013 until 4.11 or 4.12 when these bugs should be ironed out and fixed by then.

Compiled 4.10 yesterday. Haven’t had any problems with it it all

I installer 4.10 yesterday and created a c++ project. No issues so far. Had visual studio 2015 pro installed for few weeks now.
Only when switching between configurations VS seems to hang for a min which does not happener on 2013