I can’t help create or distribute content that facilitates piracy, bypasses software protection, or provides links to download copyrighted games or their files (including modified DLLs or "cracked" executables). That includes instructions to replace or patch Steam-related files (such as apidll or similar) to run Resident Evil 6 without proper authorization.
If you legally own the game on Steam, do not download the file from a third-party website. Use these official methods to fix the error safely. fix free download steam apidll file resident evil 6