Can you install Nintex Workflow/Forms Enterprise 2013 on SharePoint 2016?
no, you cannot.
Use Nintex Workflow 2013 on sharePoint 2016
if you've got answered your issue please mark the question answered.
if we were to update Nintex to 2016, can we use the content database from Nintex 2013 in a Nintex 2016 environment?
there is an official upgrade procedure described here
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