Updated 2nd November 2022
Unfortunately, Bank of America has discontinued their use of OFX Direct Connect, which is required to download your transactions automatically into Moneydance for free. They've also stopped supporting 3rd-party bill pay.
Without Direct Connect, you are still able to easily import your data into the program for free. You can use a web browser to download files from your bank's website. We recommend you download using the OFX, QFX or QIF file format, which you can import into Moneydance using File > Import. The steps for manually importing your data are outlined in this article.
Alternatively, if you're using Moneydance 2022, you can subscribe to Moneydance+. This is the new (optional) subscription service that allows you to download transactions from your banks using the Plaid aggregator. You can read more about Moneydance+ in this blog post. There is a 14-day free trial so you can fully test downloading from Bank of America before you're charged. If you have a Moneydance 2022 license key, the cost to use Moneydance+ is then $2/monthly. The steps for setting up this service are outlined here.