There are three main reasons why players search for this specific download:

Fixing Errors: If your game displays a "Data Pack incompatible" error, replacing your existing dt30-g4.cpk with a clean version often solves the problem.

Repack Fixes: If you are using a highly compressed version of the game, some Data Pack files might have been stripped out to save space. How to Download and Install dt30-g4.cpk for PES 2018