If you enjoy the work found in such archives, consider supporting the artist directly through their official Patreon or other storefronts to ensure they can continue producing content. Monthly Ranking for Patreon Adult Animation - Graphtreon
While I cannot verify the specific contents of a third-party .zip file, an archive from this specific timeframe (January to August 2021) typically contains: File: Bluethebone_2021_Jan_to_Aug.zip ...
Files shared in .zip format through third-party forums or file-sharing sites often contain unauthorized re-distributions of an artist's paid content. If you enjoy the work found in such
Preliminary drawings or "Work-in-Progress" shots usually reserved for Patreon supporters. File: Bluethebone_2021_Jan_to_Aug.zip ...