While I was not able to find a download all button for my entire library I did find that if I broke it up by searching for (example.. dictionary, Bible, commentary, lexicon, grammar, concordance, etc..) that whenever it returned books with whatever search parameters were in it, that the download all button appeared for all the books that were returned for that search. Sweet! That made it much more bearable and thank you Logos for adding that functionality. At least this was my experience, I have an Acer W500 tablet.