In order to get past this message, you should log out of, and then log back in, to your Quicken account, as follows:
1) Go to “Edit” > “Preferences” > “Quicken ID & Cloud Accounts”;
2) Click "Sign in as a different user";
3) Sign out and then sign back in, using the same credentials;
4) Then, shut down Quicken, reopen it and try the download.
If you still get the message after performing the above steps, I would suggest that you update the account directly from the account register, rather than using One Step Update.
Let me know how that goes.
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