A reputable community archive containing various versions, including 1.31.1. RepackGames (Method 1 in Reddit threads) Listed in communities like
Downloading legacy game patches like 1.31 raises practical and legal considerations: Warcraft 3 Frozen Throne 1.31 Download
After your completes, follow these steps to ensure it runs perfectly. Warcraft 3 Frozen Throne 1.31 Download
Patch 1.31 was a massive "behemoth" of an update that modernized the game without losing its original aesthetic. Key features included: Warcraft 3 Frozen Throne 1.31 Download