You need to reach the Global Support section on the Siemens website to be able to obtain the information you need because I couldn't find anything on the websites listed on Google and other search engines.
Luckily, they still have a website and a form to fill to send the inquiries to their support team. Access the following link that will lead you to the contact form. Only then you'll get the system requirements for MS1800-V2.1 and availability status.
