Abbey Road Modern Drummer Installed but Paused and repeated Download Failed message

Purchased Abbey Road Modern Drummer, problem as described and has occurred repeatedly.
The software observed to download in full via Native Access (7.85GB/7.885GB), then becomes stuck before Download Failed message appears, and download pauses permanently. All content IS downloaded to the correct folder path, in a subfolder, and includes the .ncint file as well as kits/samples/etc.
I have installed it to an external SSD. All other NI software purchased together with Modern Drummer has installed correctly. All updates install normally, just this software. I have tried all recommended fixes (private relay/granting disk access to NTKD/Native Access, etc.)
Is there any fix for this, please? And if not, how do I go about getting a refund? Advice appreciated.
Mac OS Sequoia 15.5, M1 Pro MacBook Pro Native Access ver 3.18.1.
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