If print jobs are waiting in the Windows spooler, PrnInst displays a notification:
You can update your driver in:
Manual mode. Manually remove current print jobs from the spooler. To check if the queue is empty and to continue with the driver update, click Refresh.
Automatic mode. PrnInst deletes all print jobs from the spooler and continues with the updating.
To verify that your printer drivers are updated, check the driver version in the About tab after the update. If the old version displays, restart Windows to finish the update process.