This is usually caused by the browser's download settings. Chrome has a feature similar to a popup blocker that can prevent multiple files downloading, and this sometimes catches the BACS file incorrectly. To allow downloads, add an exception for https://go.accessacloud.com in your browser settings. See your browser's help files for guidance, or contact your IT team.
To regenerate the BACS file, unallocate and reverse the payments, then rerun the remittance. If you need help with this, contact the support team. If you have trouble reaching us, see Get support in Access Financials.