"We're sorry! We see that you use multi currency, which means you can't convert your file to 'Quickbooks for Mac'.
If you need to convert, use a backup that was made before you enabled multi-currency. If you do not have a backup, then you can start a new company file in 'Quickbooks for Mac'."
Resolution: Remove the multi-currency settings
from your data file and then convert it to Quickbooks for Mac.