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See http://www.devhut.net/2018/05/03/access-unlocking-an-access-vba-project/
You can Google the subject to find numerous other site and videos that explain what to do.
Daniel Pineault, 2010-2017 Microsoft MVP Professional Support: http://www.cardaconsultants.com MS Access Tips and Code Samples: http://www.devhut.net