Error:

Could not load type 'System.ValueTuple2' when trying to log into NVivo 14 Windows.

 

Solution:

This error indicates that your computer device may be missing one of the Windows components used by NVivo - the .NET Framework version 4.8. 

Please download and install .NET Framework 4.8 from the link below.
https://go.microsoft.com/fwlink/?linkid=2088631

Also be sure any required Windows updates have been installed.