Reposting this from a problem thread I started so that it may be more visible and help anyone else still not able to download…
FINALLY GOT IT TO WORK! 😎
In brief: switch Financial Institution from "TD Bank Online Banking" (direct connect) to "TD Bank Web Connect".
My Steps:
Edit each TD account in Quicken and deactivate online services, then go to the General Tab and clear out the current financial institution value (remove "TD Bank Online Banking").
When done, edit any TD account, activate online services. When searching, put in TD - followed by a a space, because by itself "TD" yields yields no hits. Select TD Bank Web Connect.
Enter your credentials in the TD web form that opens in your browser.
Link your accounts from TD to Quicken accounts.
Voila!
In my case, it didn't download transactions from the beginning of time, it only downloaded transactions since my last successful download at the beginning of August, so it was perfect for me.
Hope it works for anyone else having issues…
(I don't know which method is supposed to be used, but this is the only one working for me, so I'll use it.)