That file you see on The Pirate Bay or random forums: Do not download it.
If you don’t own the game:
Wait for a sale – Jagged Alliance: Back in Action often drops to $2–$5 on GOG/Steam.
Then patch it safely. Jagged Alliance Back In Action Patch 1.13 E.rar -FREE-
The filename Jagged Alliance Back In Action Patch 1.13 E.rar suggests the following contents: That file you see on The Pirate Bay
The game (released 2012) received official updates up to version 1.13 (note: no “E”).
These patches fixed AI, stability, and UI issues.
Where to get them LEGALLY for free: If you don’t own the game: Wait for
No “E” variant exists in official channels.