I'm not sure why you want to deauthorize. You can have several computers authorized to the same account.
Install ADE (or Reader Library) on the new computer.
Authorize the new comuter to your ADE account
Connect device and authrize the device to new computer as well. (The reader can be authorized with mutliple computers)
Import your ePub files to your ADE (or RL) and drop them to the reader from within ADE.
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