You must have Administrative rights on the computer to install drivers and system-level files.
Since is an older version (current versions are 12, 19, 22, etc.), here’s what you need to know: flexi 8.1 install
Network and server-based license setups
Reduces post-install configuration time from ~45 minutes to under 10 minutes, especially for new users or shops upgrading from older versions. You must have Administrative rights on the computer
to advance through the installer. Accept the license agreement to continue. Input your User ID and Password if prompted by the setup. flexi 8.1 install