I have been using Visual Studio 2015 Preview and C# 6 features for a few months. This week the .Net framework 4.6 (displays in control panel as 4.5.3) suddenly stopped working, with the effect of C# 6 syntax sugar is no longer compiling.

This was most likely caused by the fact that the preview license has expired, however I am not able to find a fix for that. Installing a Visual Studio 2015 Release Candidate did not help. Trying to uninstall and re-install the .Net framework 4.6 did not help either - I get the error ".NET Framework 4.5.3 Preview or a later update is already installed on this computer." when trying to re-install the framework.

Can anyone help with resolving the issue?