While checking Roles & Features during the installation process, the FreeFlow Core Installer repeatedly prompts the user to reboot the system instead of continuing the installation process.
This problem occurs if Windows 10’s Print Management utility is missing due to various reasons associated with Windows Update and/or upgrading from Windows Home to Pro Edition. To resolve the problem, repair Windows using one of the methods (solution number 2 is recommended) outlined in the following bulletin before attempting the installation again: https://windowsreport.com/windows-10-print-management-missing/