To install dPos from the dLSoft CD just run setup (or let it run automatically when the CD is inserted into your computer) and follow the on-screen instructions.
To install from the smaller download file (the stub installer) just run the installer and it will install the program and connect to the internet to obtain the other components if required. The stub installer will NOT correctly install the product on a machine that does not have an internet connection. A larger installer (the 70 MB full installer) is available for download on request and may be used to install the product onto a machine that does not have an internet connection.