If you are one of the few, the proud, who has already purchased Jason Tondro's awesome intro adventure for Arthur Lives! the Best Knight in the World, I'd like to humbly recommend you download it again for a better experience.
I accidentally uploaded a PDF that hadn't been optimized correctly, resulting in a 15MB download.
The new file is less than 3 MB and has Bookmarks as well.
Sorry for any inconvenience the original file created.
Edited to add: If you haven't gotten the adventure yet, no worries, you will get the updated, optimized file.