Do you have word? If you have, you could use toxaris word-addin to produce an epub. Of course you would first need to clean up the formating of your book with styles. If you have no knowledge about that, I could give you a simple word template to get you started. It would take some time to manualy apply the styles, but not more than to eliminate all the errors you will get with your file now. Toxaris add-in will produce a very clean valid epub. Getting used to styles will also help you, if you plan to write additional books. It is really simple and much faster than manual styling, after you createtd the styles you need. And you get an easy to convert, easy to change formating etc. book.
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