Thank you for reaching out Datawatch Community. The dependency of Modeler's bit type will be the same with the MS Office bit type. If you are running a 64 bit MS Office, you should have a 64 bit Modeler version 12. 32 or 64 bit of MS Office for 32 bit of Modeler version 12.
Based here on our records, you are entitled for a free upgrade, or if you choose to get the 64 bit of Modeler version 12. Just send us an email to firstname.lastname@example.org and we will provide you the link for the installer.
Datawatch Global Support