A museum blog post on this 'Bonus Socius' collection is here (it seems the original publication was in the 13th century):
https://www.metmuseum.org/exhibitions/l ... -companion
An annotated edition of the book (published in 1910) is here:
https://archive.org/details/goodcompanionbon00mage
That latter book looks to have all the answers (I was originally going to ask if anyone was able to decipher the diagrams).
Actually, that book only has some of the problems, so maybe some deciphering is still needed...