Hi, @ach form.

Yes, you're right currently the link to download the ACH form is unavailable. 

Right now, our engineers are checking the root cause of the issue.  In the meantime, you can contact the QuickBooks Payment Team to ask about other options on how to download the ACH form.

You can click this link to reach out to them: Contact Payments or Point of Sale Support.

To learn how to accept credit card or debit card payments in QuickBooks Online, you can read through this article: Process a credit card payment in QuickBooks Online.

You can always come back if you have additional questions about the ACH form. We'll be happy to help. Have a great day!