INSTALLATION: 
Download 1Z Zip file 
Extract to you PC

Copy and Paste all files: 
Dinput.dll
Dinput8.dll
SplinterCellUser.ini
XInput1_3.dll
XinputPLus.ini

LOCATION on your C or D drive - COPY ALL FILES TO 
DATA - SteamLibrary > steamapps > common > Splinter Cell > system 

*SPECIAL NOTES
Being that I'm still working through trial and error, please note the following flaws: 

With ini file, most controls work with Xbox controller:

Y - Jump 
A - Interact
B - Crouch 
X - Equip Weapon (A button while equipped to reload) 
RB - Quick inventory ( Hold RB and use Mouse to select - weapon, health, pick, or health)  Sorry still working on this 
Left Dpad - Night vision 
Right Dpad - Thermal (does not unlock until mission 5) 


ESC button for full inventory 
EAC and mouse to exit out of game or navigate menus 
Loading Game requires  mouse to launch game but while intro is playing you can press A button on controller to skip