When a game’s file size exceeds the limits of hosting platforms, it is split into a "multi-volume archive."

The developer, , frequently posts development logs featuring bug fixes and new content. If you are still running 0.43.4, consider checking for the latest "Free Release" to access the newest characters and quests.

You must have all parts (e.g., part1, part2, and part3) in the same folder to successfully extract the game. How to Extract Version 0.43.4

You cannot open part 2 on its own. It contains only a middle segment of the game's data.

Technical Guide: Managing Multi-Part Archives for Goblin Layer

If you get a "CRC failed" or "Unexpected end of archive" error, one of your parts (often part 2) is likely corrupted. You should re-download that specific segment.