Official previews on Y3DF.com contain large "Sample" watermarks. The full repack is sourced from the HD master files, removing these distractions. Furthermore, any mosaic censorship (common in certain distributor versions) is stripped out.
: These packages are often used to consolidate multiple individual updates into a single installer or folder, making it more convenient for users to keep their files current without downloading numerous separate patches. Y3DF.com - Full Repack -update-