How to install:
- Extract the zip file (lotddata.zip).
- Copy the content (YGO_DATA.dat, YGO_DATA.toc) to the game installation directory (usually C:\Program Files\Steam\steamapps\common\Yu-Gi-Oh! Legacy of the Duelist\) and replace the original files (Create a backup previously if you want).
- Execute the game. The mod must just work, and no save data will be modified.