I recently reimaged my machine, with only VS2015 installed (no VS2013). I found a workaround to get Ifsharp working, by changing App.config to use the latest MSBuild.

There is a problem with the automatic running of Include.fsx, which produces error messages in my log file:

2016-03-01 16:36:04 - input.fsx(8,1): error FS0082: Could not resolve this reference. Could not locate the assembly "FSharp.Data.TypeProviders.dll". Check to make sure the assembly exists on disk. If this reference is required by your code, you may get compilation errors. (Code=MSB3245)
2016-03-01 16:36:04 - input.fsx(8,1): error FS0084: Assembly reference 'FSharp.Data.TypeProviders.dll' was not found or is invalid

I was able to workaround this by commenting out the TypeProvider.dll reference in Include.fsx.

This raises the question about whether to automatically include DLLs using this strategy. There have been similar issues with including FSharp.Charting: #52