No add-in in Word 2013. Make sure to enabled macro trust in Options.
To avoid error 4605 during add-in install:
Options>General>Unchecked "Open e-mail attachments and other uneditable files in reading view"
If Margin keeps showing zero:
Options>Display>Checked "Show white space between pages in Print Layout View"
For error 4068: Value out of range:
Delete all page & section breaks in View> Outline mode.