The Adobe Bridge - Photo Downloader shows <None Detected> with a new Sandisk Extereme Pro CFexpress card reader attached. I can see the iamegs (Raw files) in bridge but the downloader does not see the device.
What OS are you using
Mac OS Catalina
By way of additional information:
I plugged a Lexar USB 3.0 Multi card reader into my iMac alongside the Sandisk card reader and copied the folders from the CF Express card in the Sandisk to a Compact Flash Card in the Lexar.
I then ran Photo Downloader and it immediately worked as usual, taking the raw .CR3 files off of the CF card, naming them as I have specified nd converting them to DNG files.