Press the Install button to download the latest version and run the installation file. With the installed version of OPOS.Cash you can sell ski tickets of a virtual resort. Any other requirements for the installation and demo operation of OPOS.Cash are listed in the documentation, which you can also download from this page.
To run the OPOS.Cash" software, you will need Microsoft .Net Framework 4.0. Note that you need administrator rights to install .Net Framework.