Created Unassigned: Installation Error Office 2013 [25788]

Previously, this plug-in worked

Office x64 via O365 on Windows 8.1

Error reported in Message Box

Problem during startup of OLAP PivotTable Extensions:
The given key was not present in the dictionary.
at System.Collections.Generic.Dictinoary'2.get_Item(TKey key)
at OlapPivotTableExtensions.MainForm.ResetCulture(Application app)
at OlapPivotTableExtensions.Connect.OnConnection(Object application,
ext_ConnectMode connectMode, Object addInInst, Array& custom)