I've got you covered, @erkatz. I can share with you other options on how to upload transactions in QuickBooks Desktop Pro 2018. 

You're right that access to QuickBooks Online Banking and other services through QuickBooks Desktop 2018 software has been discontinued beginning May 31, 2021. For more information, please visit this page: QuickBooks Desktop service discontinuation policy and upgrade information.

If you wish to continue using the feature, I recommend upgrading your software to the latest release. Otherwise, you can use a third-party application that can handle QIF available on the Intuit Marketplace. 

Additionally, I'll be sharing this resource about the process of uploading data in QuickBooks: Download Bank Feed transactions. Once done adding the entry into QuickBooks, you can start reviewing and matching them. This is to link the transactions together to avoid duplicates.

Don't hesitate to tag my name if you have other banking concerns in QuickBooks. I'll be happy to lend a hand. Keep safe and take care!