I've got your back, @DesiraeSA.
First, let me share the possible reasons why you're having the said error when importing your files into QuickBooks:
- QuickBooks wasn't installed or a damaged installation of the program.
- Pending Windows updates.
- The file format isn't supported.
I have the needed fixes to resolve them. First, let's ensure to install QuickBooks Desktop on your computer. If you already do, then let's perform a clean install to refresh the system.
Then, let's make sure your Windows is up-to-date to prevent an error like this. Here's how to check for any pending updates:
- Click the Windows icon, and then select Settings.
- Choose Update & Security.
- On the pop-up window, you'll know if your operating system is updated. If not, then you can just click the Check for updates option. Then, follow the on-screen prompts to proceed.

Also, please ensure to import a .qbo file. This is the format supported in QuickBooks Desktop. Since you have a Quicken file, you can consider converting it first, or you can use a third-party app/service to achieve this.
To answer your questions, yes, there's a way to import the CSV file from your bank. You can convert it to an IIF format. To do that, you may follow this article as your guide: IIF Overview or use a third-party app as well.
When you're ready, you can now proceed with importing the file. Here's how:
- From the Banking menu, select Bank Feeds.
- Choose Import Web Connect Files.

- Select the .QBO file you saved, and then Open.
- Choose your bank account.
- Click Continue, and then OK when you get the prompt for a successful import.
In case you encounter any Web Connect import errors along the way, you can use this article to resolve them: Fix Web Connect import errors.
Then, you can go to the Bank Feeds Center to review your transactions. If need be, you can add and match your transactions to prevent duplicates and ensure they're accounted for correctly.
Feel at ease to comment back below if you have some follow-up questions about handling your files in QuickBooks. I'll be here to lend a hand.