FreeFileOpener is distributing a custom installer which is different from the originally available distribution. The new installer complies with the original software manufacturers' policies and terms & conditions. Optimum Installer is an install manager, which manages the installation of your chosen software. In addition to managing your download and installation, Optimum Installer will offer free popular software that you may be interested in. You are not required to install any additional software to complete your installation of your selected software. You can always completely remove the programs at any time in Windows' Add/Remove Programs.