You asked a similar question in 2023;
In answer @Phil of dCS Support asked you to contact him. I recommended you to contact Support in my reply above. Did you do this?
Theconsumer software updates for the era of Elgar/Delius/Purcell l were made via CDROM which are no longer available. This required a dCS transport with IEE1394 interface. If there is an alternative way of doing this even if you can locate the files I anticipate that you may need advice from dCS Support for advice on using the SUC port.
In any case the AES protocol of Purcel’s time is limited to a maximum sample rate of 96KS/s, To exceed this a dual AES interface is required. However there is only a single AES input. The dual AES interface is an output. Software versions for Purcell up to and including v.2.3 do not affect the AES input. I am unable to find any reference to a v.2.5. or higher.