Ignore the tone of the previous post. You did not make ".... a really major mistake.". The newer versions of ADE have a capability for a new version of DRM that hasn't been cracked (not least because it's never been seen in actual public use yet). If you want to be able to remove DRM and back up your books it's likely worth downgrading to avoid potential issues in the future. If you're a read once and don't care about the book after that, it probably doesn't matter.
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