You'll have to ask about DRM removal specifics at the same place you get the removal tools (you can get help in the comments section) as we aren't allowed to discuss it here.
That said, Mobipocket Reader uses a device/install specific code called a PID (I'd guess this is the issue you're running in to) and books are encrypted to that specific code. Therefore a new download is needed for each device (or install of Mobi Reader) that you want to read a book on. Hopefully you have the PID code saved somewhere for the books you are wanting to work with.
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