Before hunting for a compressed file, you need to understand why Redux is the superior version. The original Metro 2033 (2010) was clunky. The Redux version (2014) rebuilt the game on the superior Last Light engine.
Quick example commands (Windows PowerShell / CMD & common tools) metro 2033 redux highly compressed best
If you own a low-end PC (e.g., Intel HD Graphics, 4GB RAM), Metro 2033 Redux is surprisingly forgiving. You can run it at 720p low settings. The compressed version saves you download time, but won't make the game run better than the original. Before hunting for a compressed file, you need