First reinstall DataBridge... the error you are getting is fixed in the most recent version.
To replace the file manager fields with simple file upload fields, just delete each of the <div> tags with class="htmleditor_upload".
Then add input type file fields in their place.
Then add the File Upload server behavior 5 times for the 5 fields and update the Update Record server behavior to bind the columns to the file upload field "Server File Name" for the corresponding upload server behavior.