Symptom
When linking to an Office 2013 or later (such as Office 365) document, Labeler gives an error: Could not find installable ISAM
Cause
Later versions of Office overwrite components that Labeler uses for linking.
Resolution
Quit Labeler.
Install the ACE 2007 driver from this link:
When you open your label file, you may receive a message Error loading column names: The ConnectionString properly has not been initialized. On the Data tab, edit the data connection, then apply. The data should become visible again. You may need to select the correct table from the popdown list.