The Journey Maestro 19.05.4 maintenance release is now generally available.
Upgrade times as follows:
Maestro AU Upgrade - Wednesday 11th September @ 2130 AEST.
Maestro EU Upgrade - Monday 16th September @ 1100 AEST.
Maestro US Upgrade - Monday 16th September @ 1400 AEST.
Please see the following release notes and resolved issues link for further details: Journey Maestro 19.05.x.