Crucial check: The pack should contain a SYSTEM folder and a LOC folder. It should never overwrite your conviction.exe (that is a crack).
: If your version is region-locked (e.g., Russian-only), you may need to download a community-provided language pack, such as the SC5 Language Pack on Nexus Mods , which includes English text and audio files. Troubleshooting Launch Issues ubisoft splinter cell conviction english language pack