can't deauthorize adobe digital editions

I have a macbook pro and when I try to open an acsm file I get an error message.  I read online to deauthorize and reauthorize ADE, however, I keep receiving a message that I cannot deauthorize and to try later.  Does anyone know how I can deauthorize it?  If not, how do I complete remove ADE from my mac so that if/when I reinstall it, it asks me to authorize, instead of pulling up my authorization info.

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