packages.config

<?xml version="1.0" encoding="utf-8" ?>
<packages>
  <package id="FluentAutomation.SeleniumWebDriver" version="2.2.0.1" targetFramework="net40" />
  <package id="ScriptCs.Contracts" version="0.8.1.0" targetFramework="net45" />
  <package id="ScriptCs.FluentAutomation" version="1.0.3.3" targetFramework="net45" />
</packages>

Steps.cs

var execPath = this.CreateExecutionDirectory();
var scriptName = Guid.NewGuid().ToString() + ".csx";

var console = new ScriptConsole();
var builder = new ScriptServicesBuilder(console, new Common.Logging.Simple.TraceLogger(false, "ScriptCs", Common.Logging.LogLevel.All, true, true, false, "hh:mm:ss"));
builder.ScriptName(scriptName).InMemory(true);

var services = builder.Build();

var packages = services.PackageAssemblyResolver.GetPackages(execPath);
services.InstallationProvider.Initialize();
services.PackageInstaller.InstallPackages(packages);

var assemblyPaths = services.AssemblyResolver.GetAssemblyPaths(execPath, scriptName);
var scriptPacks = services.ScriptPackResolver.GetPacks();

services.Executor.Initialize(assemblyPaths, scriptPacks);

var result = services.Executor.ExecuteScript("var Test = Require<F14N>();");
services.Executor.Terminate();
services.Console.Exit();

this.CreateExecutionDirectory() drops a packages.config file in a new temp dir that includes required nuget packages.