There were no detailed rules for Skaven: you only had a reference sheet with the stats, equipment, special rules etc. for the selected units only - but no points, since you were supposed to use all the models anyway. This was just done so you could immediately play, without having to buy an AB.
There are some differences with the Army Book - this is also the case with the HE units, which did not end up in their 8th edition AB.
Ruleswise, you have to play the 7th edition AB, adapted by the last Update Version Skaven AB 1.7, of April 2013).