7.7 is past EOL & unsupported. You should upgrade to the current LTS - 7.9.3 - and then on to the current version - 8.3 (8.4 expected next week) - at your earliest convenience. The current versions of the Scanners will work with those currently supported versions.
Ann
They’ll more than likely work with 7.7 too, but we don’t maintain compatibility records for EOL versions.