If you choose to proceed (for educational or archival purposes only), always:
vbindiff original.exe patched.exe -output changes.txt
Obtain a legitimate old Tera client (version 92.03 or earlier) and apply publicly available .xdelta patches. This requires more effort but guarantees you know exactly what changed.
Use the checksum.md5 file to validate downloads. Example (Linux/macOS):
If you are looking for a "feature index" of the movie's production and cast details: