No matter how many countless hours of care you devote to bug fixing and polishing your game, no game in history has ever launched without bugs of some sort. When you develop a game as large in scale and scope as The Witcher 3: Wild Hunt, the volume of unfixed bugs and errors grows to match it. While it would be inaccurate to state that the long list of bugs makes The Witcher 3 unplayable, or even unpleasant, CD Projekt Red’s latest patch has addressed a huge quantity of them–a staggering quantity.

Boasting a five page long Steam change log and a thirteen page PDF of bullet-point patch notes, the console version of The Witcher 3‘s patch 1.10 weighed in at a hefty 15GB, and the PC version is only slightly less. This figure comes from a tweet from Marcin Momot, The Witcher 3 community manager.

The @witchergame patch 1.10 is going to be around 15gb on consoles (depending on SKU) and between 6-15gb on PC (depending on platform).

— Marcin Momot (@Marcin360) October 8, 2015

The patch was released in preparation for the soon-to-release Hearts of Stone expansion, to become available on October 13th, and includes bug fixes, gameplay changes, and performance improvements. There are over 600 changes in all.

Momot posted about the patch on the game’s official forums, where he stated the following:

[I]t’s the largest collection of fixes, improvements and various enhancements we’ve brought to The Witcher 3: Wild Hunt to date. All told, it packs a pretty impressive 600 changes, including fixes for a load of quests, optimizations that’ll make things smoother on PC and consoles, over 150 stability improvements to iron out hiccups, additional conversations with key characters that will enhance your relationships with them as well as the story as a whole, and a major and much-awaited fix that should take a good bit of the pain out of dealing with items in the inventory by improving how items are ordered and sorted.

Many players may now be working through New Game+, but the upcoming DLC is the first and smallest of three confirmed content additions planned for the game. Be sure to grab yourself a copy of Hearts of Stone on October 13th if you belong to that group of players.