If it is some year old it might be possible that you have to do a complete update of the internal OS at first since otherweise it will not work at all with the latest aquasuite software.
If your aquaero is showing a firmware starting with 3.xx you will have to update the internal OS at first. You can download the necessary tool
here.
Afterwards download the
latest aquasuite software.
In the aquasuite flash the latest firmware: click on aquaero in the menu bar, then flash firmware and selectaquaero_firmware_422a.afd4. That way you can also do an update of the firmware if your aquaero already has a firmware that starts with 4.xx.