Need to msbuild C# project of lower version on commandline, without Visual Studio

I need to msbuild C# project of lower version on commandline, I donot have Visual Studios.

I am facing the error while building the project:

Microsoft (R) Build Engine Version 2.0.50727.42
[Microsoft .NET Framework, Version 2.0.50727.42]
Copyright (C) Microsoft Corporation 2005. All rights reserved.

.\Project.sln : Solution file error MSB4054: The solution file must be opened in t
he Visual Studio IDE and converted to the latest version before it can be built
by MSBuild.

I have the .sln file and previously someone did build the project from here possibly with the Version 1.0 engine.

Can someone help me with this?

Solution

Ok, got permission from client to install VStudios. Installed and built the program :/