Caution installing Visual Studio CTP 4

Caution installing the Visual Studio CTP 4 on your development computer. There is a installer bug that overwrites the current production 4.3.1.0 FSharp.Core.dll with a 4.4.0.0 dll. This bug prevents any successful builds on your computer using that version of F#. To resolve this issue, I deleted the contents of that folder and then restored the files using the 3.1.2 installer. Control Panel > Programs > Programs and Features > Microsoft Visual F# 3.1.2 > Change > Repair. After restoring the 3.1.2 files, I'm able to build in Visual Studio 2013 or 14. However, CTP 4 can't build portable libraries without a workaround. :(