Hi @andrewatfornax,
That log was from my 4.0.1 to 4.0.2 upgrade.
The log after that, is from 4.0.2 to 4.1, which does not show the acknowledgement that it found 4.0.2.
From the install.log file for 4.1 (failed attempt):
Attempting to detect an existing Revive Adserver installation...
schema file found: -----------/etc/changes/schema_tables_core_621.xml