The obsolete operating systems can usually be legally obtained from WinWorld. You can usually run obsolete operating systems inside virtualisation software such as VirtualBox virtualisation software. DOS, Windows 3.1x, Windows 95/98, or Windows XP for example. Some programming software may require an obsolete operating system such as M.S. If you choose to program your own radio, we urge that you allow plenty of time to self-learn about your radio and the programming process - it's not always straightforward. Furthermore, we will not offer technical support for installing software, COM port issues, cable issues, driver issues, programming or updating the firmware of your two way radio(s). Whilst Radiotronics can provide the tools you need to program and configure your radios, we will not help you program them. PLEASE READ: Programming Support Unavailable > Download Area: Your Downloadable Products in Your Account Once authorised, you can download this software from Your Downloadable Products area of our website. During this time your download will show as 'Pending' and will become available once your order has been authorised. Some software orders require a member of our team to check eligibility and due diligence.