The problem is that eManualOnline…
The problem is that eManualOnline advertises "offline viewing on Mac/PC", but the VirtualBox software they require for viewing the downloaded OVA file is not compatible with modern Macs using Apple silicon by eManualOnline's own admission. Offline viewing can be essential if you don't have Internet access where you work on your car, and based on my experience, download speeds from the eManualOnline website are probably too slow for practical online usage. Despite advertising features they could not support eManualOnline refused my request for a refund, which is clearly a breach of implied warranty in US law.