The original games used physical CDs to generate monsters. Since modern PCs and the Nintendo Switch don't use CDs the same way, the DX version uses a massive to let you search for songs and artists. Here is the problem with "Free" Cracked Versions:

Monster Rancher 1 & 2 DX frequently goes on sale on Steam. You can often snag both games for a fraction of the original price.

Many pirated versions cannot access the updated online database, meaning you’re stuck with basic monsters and miss out on the legendary ones.