To install the proper version of JChem for Office, first, you need to check the exact version of Microsoft Office, which is already installed on your computer. It can be 32-bit or 64-bit versions of Microsoft Office.
{primary} If Microsoft Office-64-bit is installed on your computer, you need to download and install the 64-bit version installer of JChem for Office.
If Microsoft Office-32-bit is installed on your computer, you need to download and install the 32-bit version installer of JChem for Office.
To check the bit-version of your Microsoft Office: