StarFriend was developed as a dedicated server and LAN emulator designed specifically for StarCraft II: Wings of Liberty and later updated for the Heart of the Swarm expansion. Version 1.54

Compared to the current version of the game, the 2.0.9 client is less demanding on older hardware, making it a "legacy" choice for retro-gaming setups. The Modern Context

The 2.0.9 patch focused on balancing and refining the Zerg-focused expansion: StarCraft Wiki The Zerg Campaign