Paste them into the game's installation directory (where the game's main .exe is located), replacing the existing files when prompted.
If you are trying to install this specific release, the standard process for CODEX scene releases is as follows:
The file typically refers to a cracked version of the game Blue Fire , released by the scene group CODEX . Installation Guide
For help with gameplay rather than installation, you can access the following:
Look for a folder named inside the mounted ISO/folder. Copy all contents from the CODEX folder.