Can you let me know, were you found the Linux client? As I am aware there should be no Linux Client for a very long time (over at least half a year)
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The books are required for professions. You can learn them in the profession window. You can find the profession window either in the top left of the inventory or by pressing "K". Drag and drop the book in one of the free education slots or click on one of the slots and select the book in the menu which pops up.
If you want to support us then you are welcome to do so through the ingame shop. This supports us the most, since your donation comes directly and without detours to us. And in addition you also get something for your money.