1st make sure the edit option is on in the form. Make sure you have the Edit URL set in FormMule.
I believe there is an option in FormMule to bulk load the edit URLs. That might fix the problem.
If the above doesn't work, you can select the same spreadsheet as the output from the Google form.
Then then have to fix the formulas to make them work. Then copy the status columns from the old sheet to the new sheet.
I don't have a lot of experience doing the above. My memory is that it is possible to get the edit URL working again without selecting a new response destination.