It shows version v81 which is still Sirens of War version. What he sees is patcher updating the game and it may take few hours to finish.
It's weird because links to old version were taken down right after we upgraded to New Horizons, on 8th April. Maybe he downloaded game before that.
He can either wait till patching process will be done or re-download the game. Both should take around same time, although re-downloading should be quicker and is more reliable.
