What is the relationship between this handbook and the one hosted at https://www.effectivealtruism.org/handbook/ ?
The handbook at the above link is available in epub, mobi, and pdf formats, which seems to answer the requests in the comments here. Is it an older version? The cover indicates that it is the second edition, but sadly does not include a revision date.
It looks like the EA Pen Pals project is closed for lack of funding.