Hi @Anonymous,
Do you want to use the microsoft flow with Office 2016?
You could use the microsoft flow with some Dynamics 365 plans and Office 365 plans currently,
also you could try the flow free trial or Flow plan1, Flow plan2,
You couldn't use the microsoft flow with Office 2016 currently,
You could refer to link below to learn more about the flow pricing:
https://asia.flow.microsoft.com/en-us/pricing/
Best regards,
Alice