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Once you set up Calibre, click on Add Books and pick out any free ebook files you ve downloaded. They ll appear in the Calibre library. Now click on an entry in your Calibre library and choose Convert Books from the top bar. In the upper right-hand corner, make sure to set the Output Format to Mobi. Click OK, and wait until the Jobs number at the lower-right of the main screen goes from 1 down to 0.