Kim, we have now released version 2.400. Go to your mtu.com store email with your Microstudio serial number, email and download link. Click the link again. It will show you will download mstudio2315.exe. Download it. The code within this file is 2.400. Our software delivery script embedded in our e-Commerce store forces us to have to do this
Uninstall 2.315 and then install 2.400. I hope this solves your problem.