T.2.1 GP-Pro EX cannot be installed

T.2.1.1 Does your PC meet the operating environment of GP-Pro EX?

T.2.1.2 Before installing, did you log in to Windows using an account with administrator rights?

T.2.1.3 Is "Multilingual Manager" activated when "RAKURAKU CHUGOKUGO" (V2, V2 + translation, V3) or "RAKURAKU KANKOKUGO" (V1.5, V2) is installed?