@kestelli 

You may have 2 ways to migrate your data:

1. Create a new file (multicurrency is disable) on QBD 2016 and utilize a migration tool.

https://transactionpro.grsm.io/qbd

2. Purchase a 3rd party service to disable the multicurrency feature and convert your file to be open on QBD Mac 2019. Contact us in private for details.