Thank you everyone for your inputs, specially to Mario Igrec who gave me a straight path to resolve all my issues, in this topic
Installing old PHP 5.4 version did allow me to run migrations using the LTS routes suggested by Visvanath Ratnaweera, in another topic https://moodle.org/mod/forum/discuss.php?d=409798#p1653628
Installing old PHP 5.4 version did allow me to run migrations using the LTS routes suggested by Visvanath Ratnaweera, in another topic https://moodle.org/mod/forum/discuss.php?d=409798#p1653628