The date of the last update (28th July 2015) indicates that the pack in question is somewhat dated. Digital content, especially fan-made comics, often sees updates as new material is created. A pack from this time would include all the comics produced by Shadbase up until mid-2015.
As platforms like Tumblr enacted "NSFW bans" and artist websites went offline or changed domains, these community-maintained packs became the only way to view the work in its original quality. shadbase comic pack last update 2872015 al full