• Replaced censored textures with the originals
  
• Fixed music not playing at the correct speed
  
• Redone music scripts, added unused tracks
  
• Changed mission computer formatting to be consistent
  
• Fixed some objectives updating incorrectly
  
• Fixed secrets using the wrong sound
  
• Fixed being unable to progress in Area57 after returning from Biomass
  
• Fixed manumit playermodel not fully taking effect in Area57
  
• Envelope now removed from inventory on new episode
  
• Scuba gear now removed on new episode instead of when ClearInvetory is called
  
• Scuba gear no longer given on spawn in certain maps
  
• Added missing Underwater Base dialogue
  
• Fixed scripts not recognizing very hard difficulty (skill 3)

• Music without the ‘restart’ and/or ‘interrupt’ flag restarts anyway
  
• Audio is not stopped when the game is paused
  
• Sometimes music will stop playing after loading
  
• Text on the aqueduct computers doesn't fit in the screens
  
• Text on some xenolab computers not visible
  
• Anything built into the map that can't be changed by editing its scripts

1.12 - Extract the contents to ‘[Steam install dir]\Steamapps\common\SiN 1’
1.11 - Extract the contents to ‘[Program Files]\Sin’ or wherever else it was installed

• 1. Extract the contents to [Steam install dir]\Steamapps\common\SiN 1
  
• 2. Copy pak0.sin into the new 2015 directory
  
• 3. Run the batch file and select ‘Full Installation’

To play the game add ‘+set game 2015’ to Sin's launch parameters (without quotes). You should remove it when you want to play the original.

Download here (remove the space):
[Temporarily unavailable]
sin-steam_patch and sin-retail_patch are the patches for Steam and 1.11 versions respectively, sin-steam_wages is Wages of Sin for Steam. sin-retail_wages is the 1.11 version of the Wages of Sin patch, install it the same way you install the main patch.

The original forum post can be viewed here.