private void Install(string packageName)
{
var nameVer = NameVersion.Parse(packageName);
var terms = packageName.Split(' ');
var name = nameVer.Name;
var version = nameVer.Version;
this.installCommand.OutputDirectory =
Path.Combine(Application.dataPath, "Packages/");
this.installCommand.AllowPrerelease = this.showPrerelease;
this.installCommand.Execute(name, version);
AssetDatabase.Refresh();
}