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You can de-authorize ADE, and then remove it. Then re-install version 2.01.
Note that a book, once downloaded in 4.x with the new DRM, can not be redownloaded in 2.01. ADE 2.x only supports the old DRM, so if you use this, you will always receive books using the old DRM. ADE 3.x and 4.x support the old and new DRM, and it depends on the choice of the store if you get your book with the old or new DRM.
Another point is that there are many (older) readers that don't support the new DRM, so if you download the book using ADE 3.x or 4.x, are unlucky enough to get the book with the new DRM and then try to side-load it onto an older reader, it won't work.
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