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The ACSM file should show up in your Downloads folder. Rather than double-click the ACSM have you tried the equivalent of right-click on the ACSM file? When I do that I have an option that says Open With and then it allows me to select either ADE or Sony Reader Library.
Alternatively, within the Finder window, I would select the ACSM file in the Downloads folder. Then type Cmd-I. In the Info box that opens, if you scroll down a bit, there should be a drop-down submenu for Open With. There is also a button to select "Change All..." to set the default program that works with double-click.
After you installed ADE, did you setup an Adobe Account email address and password to register your Mac with Adobe?
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