The Unofficial Skyrim Legendary Edition Patch (USLEEP) is a major mod started by Quarn and Kivan, and currently coordinated by Arthmoor, that fixes numerous bugs left over even after the latest official patch is applied. These fixes range in importance from dialogue typos to quest-breaking bugs to reducing save file bloat, and cover both the vanilla game and the official Dawnguard, Hearthfire, and Dragonborn DLCs. Originally packaged in a series of discrete mods specific to the aforementioned game components, these separate mods were discontinued in favor of the current unified USLEEP mod which requires all three of the aforementioned DLCs and was first formally released on November 7, 2015.
The major fixes are being gradually added to UESP. Should you want to help point out such a fix, please use the {{Bug}} template to do so. Specifically, you should use {{Bug|Details of bug.|USKP|version}}. Optionally, you can also add a fourth parameter to give more information on any notable details about the fix. For other variations or special cases, see the template's documentation.
Note that this patch is unofficial. The official (Bethesda-released) patches are documented at Patch; the official patches include some fixes that for technical reasons (e.g., altering the game's executable) cannot be incorporated into the unofficial patches. Therefore, installing the official patches is still recommended. Also, the unofficial patch is only available to PC players; Xbox 360 and PS3 players cannot install any third-party content.
The same team has also released the Unofficial High Resolution Patch which fix bugs for the official Hi-Res DLC and is designed to work alongside USLEEP.
Unofficial Skyrim Legendary Edition Patch Download Locations
The download can be found via any of the following methods: