Should an application built under .NET 4.5 but have libraries built before .NET 3.5 work on .NET 4.5?

Question

.NET

That is, if the project has libraries from 2.0, 3.5, 4.5, then all these dotnet versions need to be installed?
I must say right away that now there is no time to check all this. If anyone knows, please share the information.

Answer 1

2.0-3.5
4.0-4.6
are 2 different branches. So you have to put

Answer 2

No, only older

Answer 3

Yes all. major versions are not interchangeable, minor ones are. 4.7 replaces both 4.6 and 4.5 and 4.0, 4.x does not replace 3.5 and 2.0, 3.5 does not replace 2.0.