The Repack package can be downloaded from various online sources. Please ensure that you download from a reputable source and follow the installation instructions carefully.
"R.G. Mechanics" is a well-known group that compresses game files to make them smaller for quicker downloading. A "repack" is a version of the game that has been compressed and usually includes all updates and cracks pre-applied. Helpful Resources for SimCity (2013)
Most of the "agent-based" pathfinding bugs (where Sims would get lost or stuck in traffic loops) were significantly patched. The Complete Package: The 17 DLCs