The AccredoODBC.mez file is installed with the Accredo ODBC/OLEDB Driver.
To use the Accredo ODBC Connect the AccredoODBC.mez file
needs to be copied to :
Documents\Power BI Desktop\Custom Connectors
Then Power BI needs to be set up to allow non certified Data connectors to be seen:
File > Options and Settings > Options > Security > Data Extensions
Select "Allow any extensions to load"
AccredoODBC will then appear in the list of Other data sources.