I appreciate you getting back to us, @reolsen.

There are two possible reasons why you can't select your existing bank account from your bank feeds to download your transactions. It could be:

• Your bank is having a website maintenance as of that moment.
• Your QuickBooks release version is not updated.

I'd recommend verifying the website maintenance from your bank. You can attempt to reconnect your bank after their website maintenance.

However, if they don't have website maintenance, let's update your QuickBooks release version. Here's how:

1. Go to the Help menu, then select Update QuickBooks Desktop.
2. Select the Update now tab.
3. Put a checkmark in the Reset Update checkbox.
4. Click Get Updated tp start the download.
5. Once done, restart your QuickBooks Desktop and accept the option to install the new release.

I'm adding this article for more details: Update QuickBooks Desktop to the latest release.

After updating the latest version, you can now select your existing bank accounts from the bank feeds and download your transactions from there. 

You might also want to check out this article to learn how to match transactions in QuickBooks Desktop: Add and match Bank Feed transactions.

If you need any additional assistance while managing your bank transactions, you can leave a comment below. I'll be sure to get back to you.