A full game build should be several gigabytes; anything under 100MB is likely a downloader or malware.
Typically found on file-sharing or modding sites; Build 1886 was a post-launch update that included various bug fixes and multiplayer optimizations. What’s in Build 1886? Overload.v1.1.1886.rar
If you tell me what you're trying to with this specific file: Install the game or a specific update? Fix a technical bug or crash? Set up multiplayer with mods like OLMOD? I can provide a more tailored step-by-step guide. A full game build should be several gigabytes;