How to reliably detect the actual .NET 4.5 version installed?

Question

My actual problem is that I have encountered two versions of .NET 4.5 full setups:

• a (possibly) older one, which is also available when downloading SQL Server

Answer 1

If someone needs the System.Environment.Version value against the .net version, arranged in a table (need to perform =Vlookup with excel etc...)
here is a plunker I have created for that.
enter the link above and you will be able to copy the this table image: