Hi there, linewalk. I'm here to assist you with your query.

The process for importing IIF files remains unchanged, so there's no need to make any modifications. You will only need to update your company file from QuickBooks Desktop 2021 to 2024, as mentioned by FateCandylaneT, and this needs to be done only once. You can refer to this article for detailed instructions: Update your company files to a new version of QuickBooks Desktop.

If you need to transfer your company data to a different folder on your computer, you can find a helpful guide in this article: Move your company files to another computer.

If you require further assistance with importing your data, feel free to let us know in the comment section. We're here to help you further, linewalk.