To re-enable the add-ins, please open the Office application, click on File in the top left corner of the application, then click Options.
A new window will open up, select Add-ins from the column on the left hand side.
In the add-ins section, you will see a table listing all add-ins installed on your PC for the Office application.
Look for the Quill Addin in either the Inactive Application Add-ins or the Disabled Application Add-ins.
If the add-in shows under Inactive Application Add-ins, click on the "Go" button at the bottom of the window. A new window will open again, please make sure the Quill add-in is ticked and then press OK.
If the add-in shows under Disabled Application Add-ins, please change the drop-down menu at the bottom of the window from COM Add-ins to Disabled Items, then press "Go"
You may see i3filemanager in this list, click on this and then select "Enable".
Once you have enabled i3filemanager, change the drop-down menu from Disabled Items back to COM Add-ins and press go.
Make sure the Quill add-in is ticked and press "OK". The Quill Office application should now be enabled again