Sage 200 Evolution

Hi my client is on ver 11.1.1 of sage 200 evolution - and we cant seem to get the BIGenerator addin to show up under addins. its not under inactive or disabled addins either. When trying to manually install it says its not a valid excel addin. They…

Whenever I open excel I got error message saying The file format and extension of 'Sage.BI.ExcelFunctions1.1.xll' don't match. The file could be corrupted or unsafe.