Search a directory and subdirectories for DLLs by name and list by Version numbers descending.

FindDllVersions.cs

var path = @"C:\dev\whatever";
var dllFileName = @"something.dll";

var files = from file in new DirectoryInfo(path).GetFiles(dllFileName, SearchOption.AllDirectories)
  		let fvi = FileVersionInfo.GetVersionInfo(file.FullName)
			select new { File = file.FullName, Version = fvi };
			
files.OrderByDescending(f => f.Version.FileMajorPart)
	.ThenByDescending(f => f.Version.FileMinorPart)
	.ThenByDescending(f => f.Version.FileBuildPart)
	.Dump();