Should i go for the EF 4.2 update through nuget or a standalone installer?

I would also like to know how the GAC works when i am using a standalone installer ? Will it override m开发者_如何学JAVAy existing assembly int the project ? if i have the express edition vs 2010 which does not have nuget ,how do i best make use of these packages without breaking my existing stuff?

You're asking several different questions here.

Generally, the GAC always overrides the bin folder for a given version of an assembly. However, if the bin assembly has a different version, and your config file points to that version, it will use that instead of the GAC.

With VS Express that doesn't have the NuGet VSIX, using NuGet is definitely a bit harder. You need to get the NuGet command line tool, and run the install command to download packages, which you can then manually reference in your projects.