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I hope the steps given below will help you to get your old xsn.
1. Open InfoPath form.
2. Go to file menu and select Fill out a form.
3. Select your form (old xsn) under all forms box in “Fill out a form” Dialogue box.
4. Click on “Design this form” in the form tasks.
5. Form is opened in Design mode then you can publish it in Share point site ...