How do I resolve Tekla Tedds Add-in disabled and/or 'Tedds Add-In Error (287)' in Tekla Tedds for Word?

Problem

When I run Tedds for Word, I get a message that the Tekla Tedds Add-in is disabled and/or 'Tedds Add-In Error'. Why is this and how can I resolve it?

The pop-up message may look like this, stating "Error (-2147467259): This add-in is installed for all users on this computer and can only be connected or disconnected by an administrator.":

Solution

The problem is that Word has disabled the Tedds for Word Add-In that adds the Tedds functionality to Word. This can happen occasionally if Word encounters a problem or crashes when Tedds is loaded.

To resolve this do the following:

Run Microsoft Word on its own.
Open Word Options (File> Options)
Select the Add-ins page
Select "Disabled Items" from the Manage options at the bottom of the page
Enable anything listed as disabled to do with Tedds (with the word "tedds" in the name generally)
OK and close Microsoft Word
Now try launching Tedds for Word