Hello there, @jsclev,
I appreciate you providing two links for me that serve as your references about your importing concern.
The "Import it for me. I'll fix it later." option is only available in QuickBooks Desktop 2019 for Windows users.
Please take note to first correct all your list entries before importing the IIF file. This is to ensure you're able to successfully import those into the program.
For more information about importing this file, here are great articles you can refer to:
You can also visit the User Guide to learn more about the processes using QuickBooks Desktop for Mac 2019.
This will get the information you need for today, @jsclev.
I'll be around to help if you need anything else. Wishing you and your business continued success.