The log files for troubleshooting can be found where Spire Server is installed in the below directories.
The spired.log should be in C:\ProgramData\Spire unless an alternate location was selected at Installation
time.
The postgresql.log should be in C:\ProgramData\Spire\PostgreSQL\14\log (PG 14) or C:\ProgramData\Spire\PostgreSQL\10\log (PG10) unless an alternate location was selected at Installation time.
The setup log file created during installation can be found in the same folder as where the Spire Server installer file was run from.