I am having issues with Excel in Office 365 64 bit. When I enable the Solver add-in and click out, click the Data tab and I get an error message. "Cannot run the macro 'SOLVER.XLAM!MainEx''. The macro may not be available in this workbook or all macros may be disabled." I also get the same error and the only change is: 'SOLVER.XLAM!GetGroupLabel'. I have enabled macros, and checked all the settings I know to check. background: PC, Windows 10 64 bit. Solver file confirmed to be SOLVER32.DLL. I have also uninstalled and reinstalled several times and also tried to repair as well. Same error. I also tried to install the 32 bit version as well with no success. I really need this to work for a Grad School class I am taking this summer!