I'm thinking error #2038 has something to do with ADE possibly not supporting TLS, which is a newer technology than SSL.
For example, the URL that ADE fails connecting to for my particular ACSM file is of this form:
Code:
13a0790921b0eed053bf-13a0790921b0eed053bfaf9e6b555ccd.ssl.cf2.rackcdn.com (104.100.192.27)
According to
Qualys SSL Lab's SSL server test, this HTTPS URL doesn't support any SSL version all; it only supports TLS 1.0 or above.
This explains how I can download the ebook using the given URL in my browser and be able to open it up in ADE, but ADE itself doesn't download it, because the version I use in WINE under Linux is from 2010, long before mainstream adoption of TLS.