Retroactive verbose error logging may be provided. Loggable event entries associated with software installation during installation may be saved. Each of the loggable event entries may have a first level or a second level. In addition, the loggable event entries associated with the first level and the second level may be saved to a log file if an error occurs during the software installation. Furthermore, the loggable event entries associated only with the first level may be saved to the log file if a milestone occurs during the software installation and the error has not occurred before the milestone occurs. The software installation may be stopped if the error occurs during the software installation and the software installation may continue if the milestone occurs during the software installation.