VS 2013 with MVC5 for VS 2012

Hi all,

I am facing some problems in installing vs 2013 in my system. problem is with installing .net framework 4.5.1. so i search "MVC5 for vs 2012" and i got a link

http://blogs.msdn.com/b/webdev/archive/2013/11/18/announcing-release-of-asp-net-and-web-tools-2013-1-for-visual-studio-2012.aspx

The doubt i have is if i install this, will it affect the older development environment? already i have so many extensions installed with my VS 2012(purchased version).

Pls anyone clarify my doubt and shall i go for installing this?

Thank you.