Uninstall the R4J Excel Add-in in Programs and Features.
Install the R4J Excel Add-in following the steps described here.
Installing a 32Bit AddIn into a 64Bit Office and vice versa will not work. This is independent of your Windows version, i.e. a 32Bit Windows can only run 32Bit Office, but a 64Bit Windows can run 32Bit Office or 64Bit Office. Follow these steps to identify your Office version:
Open Excel and create a new empty file.
Click "File" and "Account".
Click "Info on Excel" and check the first line.
If it reads something like "Microsoft Excel 2016.... 32 Bit" you are running a 32bit Office.
If it reads something like "Microsoft Excel 2016.... 64 Bit" you are running a 64bit Office.
Close Excel and uninstall the Requirements Management for JRIA addin-in For Microsoft Excel.