I have installed Adobe Digital Editions, and have previously downloaded an e-book and accessed it successfully. I have more recently purchased an e-book from a vendor in Australia, which is available under an Adobe DRM arrangement. In accordance with the vendor's instructions I registered an Adobe ID and password with ADE. I then selected DOWNLOAD EBOOK on the vendor's website, and it downloaded a file called URLLink.acsm.If I run this file without ADE running, nothing happens. If I run it with ADE running, I get the error message "Error! Check activation." And no download of my recently purchased book, though I can still see and access the book I downloaded previously (which did not involve DRM). The vendor suggested that I "Erase Authorisation" in ADE. When I tried that (many times) I got the error message "Unable to Erase Authorisation. Please try after some time". The vendor then suggested uninstalling and re-installing ADE, but nothing changed.