You can no longer preview the web application prior to uploading it to the database. Since the preview did not allow for "Calculate" commands, the rendered web application was not a true representation of the finalized product. When you have completed the conversion process, you will be welcomed by the follow screen:
From here, you can continue on to either upload your web application immediately or finish the conversion and go back to editing the Excel file.
Note: All changes made to the Excel file after the initial conversion will require a subsequent conversion. If no inputs or major changes have been made, the SpreadsheetWEB Wizard will maintain all of your previous settings so that the conversion can be completed much more rapidly any subsequent times.