Then one of the books started getting errors. So I deleted my books (academic) and added the downloaded books (. Academic .ACM files). I've just read the Caliber Help, which says that .ACM files should not be converted into .pdf (or that is the message I get in caliber). Can someone kindly tell me how I can get the files converted? I really want the books now. Thanks in advance! My E-book is currently in A4, but my plan is to have the e-book in A8. So there are two options: 1. Use an offline e-book converter like Ebooks-to-PDF — works with all the popular platforms and with almost every e-book format you can think of (other than .EPP). 2. Have the books converted in a PDF to save space. If you use Ebooks-to-PDF and you use caliber and the converter to do so then your book is fine. If you are just using caliber (without an offline converter) then no, there should not be issues. Please, do you guys have any solutions? How can I have a book printed when it says that “file not found”? There are two ways to go about dealing with this issue. If you preferred to print and e-mail your book out then you can use something like: Or else you can get a .pdf printer and download an online version of the book. For me the easiest way to use the excellent and very popular online digital copy printer for PUB books, Or you can get a printed (e-book) version with a PDF converter, like this: Here's a small sample page that I could easily make in a few minutes with this .pdf converter on my laptop. If you use a PC then I think your best bet is to get a printer and download the online digital copy printer for your operating system. This does come at the expense of having to make your own .ACM file first (which is a pain).