The "1-4" usually designates that this specific archive contains the first four segments, books, or major arcs of the series.
Detailed descriptions of "C-Shipped" digital intelligences, orbital bombardments, and nanotech warfare. File: [Goldenmaster]First Contact 1-4.zip ...
Most "Goldenmaster" archives are community-curated versions designed to clean up typos and formatting from the original Reddit posts. The "1-4" usually designates that this specific archive