Update 0.5.5.83

Fixed

Replaced the incompatible Split-Path -LiteralPath ... -Parent call in the generated post-install launcher.
Uses System.IO.Path.GetDirectoryName() for the application working directory.
Uses System.IO.File.Exists() for the post-install executable check.
The complete optional application-start call is now protected by error handling.
A start failure no longer changes a successful installation into a failed software job unless fail_job_on_error is explicitly enabled.

The install/reinstall result is determined by installer exit code and package detection. Optional application start is handled separately and logged.