Extract the downloaded zip file. In Windows, just right-click the file and choose "Extract all", then follow the instructions
Run the file "O120.exe" and wait until the introductory menu appears
After running the file "O120.exe", it is possible that you may be asked to install the DirectX components and other elements needed to run the 3d tour. For this reason allow the installation of necessary components
After the introduction menu appears press the button "3D virtual tour"
The loading of virtual tour can take anywhere from a few seconds up to one minute, depending on the performance of your computer