Microsoft .net Framework 4.5 Developer Pack Download [upd]

Very little in practice. The (a smaller download) contains only the reference assemblies and tools for building. The Developer Pack includes the Targeting Pack plus the runtime for testing. For most developers, the Developer Pack is the right choice.

NDP452-KB2901907-x86-x64-AllOS-ENU.exe (Note: The original .NET 4.5 Developer Pack was superceded by 4.5.1 and 4.5.2; however, for historical "4.5" targeting, you often need the .NET Framework 4.5.2 Developer Pack because it supports targeting 4.5, 4.5.1, and 4.5.2). microsoft .net framework 4.5 developer pack download