Having a 64-bit computer doesn't guarantee you have a 64-bit version of MS Office installed.
Users often find that they have 32-bit versions of MS Office installed. Microsoft installation defaults to the 32-bit version because it is has less compatibility issues.
See office 64 vs 32
Users need to determine which version (32bit or 64bit) of MS Office (i.e. Word or Excel) they have installed on their machines before installing Parts.
If you have a 32bit MS Office installed you will need download the 32bit version of Parts.
If you have a 64bit MS Office installed you will need download the 64bit version of Parts.
best regards,
Randy