I downloaded Heavy Mettle (Y8S3), and copied the contents of the "Y8SX" of the Plazas section in Ressources, because that's what the AI helper told me to do.
After that, I tried to launch my game, but I keep getting the Error "0xc000009a" message, and the BattlEye launcher telling me that I have an issue with launching the "steam_api64.dll" file.
I went multiple times in the R6 downloader to verify my files, but I had nothing wrong going on. I launch my game with "RainbowSix.exe" but I've also tried with all other exe files and even the "RainbowSix.bat" file, but nothing happened.