You may simply need to wait a few hours before you can complete a download.
If server maintenance isn't an issue, check the account information in your Quicken settings against the information from your financial institution on how to set up Quicken downloads.
Most of the big banks have issues from time to time. Try the steps in this video: data-inline-edit-type='wysiwyg' data-inline-edit-url='/answers/3153313' id='inline_edit_answer_3153313_body' Most of the big banks have issues from time to time. Try the steps in this video: People come to Quick Books Learn & Support for help and answers—we want to let them know that we're here to listen and share our knowledge.
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There are several reasons that your Quicken finance software could be failing to download transactions, from account setting issues to server maintenance at your financial institution.