AFTER you generated the eBook through Adobe Digital Editions installed on your PC or MAC (Laptop or Desktop computer), you will then become able to transfer the eBook to your mobile device.
Please do not download the file (URLLink.acsm) to your mobile device directly.
URLLink.acsm is like a ticket to download PDF to Laptop or Desktop computer.
Also, your eBook reader on mobile device needs to be authorized with same Adobe ID which you generated eBook on your Laptop or Desktop computer.
To read the full instruction, please Click here.