OPOS Installation Instructions As of OPOS 1.14.161 you will no longer be able to launch a successful installation process by double-clicking on the .msi file. Instead, you must now launch the installation process using either of the following steps: 1. Run As Administrator the setup.exe associated with the distribution. 2. Open an Adminstrator Command Prompt and execute an msiexec command. e.g. msiexec.exe /i "Datalogic OPOS 1_14_161.msi" /qn INSTALLCONTROLOBJECTS=1