You should download the official URSim image from Universal Robots website and Oracle VM VirtualBox from the official websites.
1.Download the most up-to-dateOffline Simulator for Non Linux from this link: https://www.universal-robots.com/download/?query=.
3.Install Oracle VM VirtualBox software from the following link: https://www.virtualbox.org/wiki/Downloads.
4.Create a folder on your hard drive and name it URSim.
5.Extract the contents of the downloaded URSim zip file to the URSim folder.
6.Start Oracle VM VirtualBox.