No. The risk of malware and the disappointment of poor quality loops are not worth the disk space.
Use a subtle high-shelf EQ to bring out the clarity in the piano patches.
If you want the Motif ES sound, you have three legal paths that are arguably better than a hacked Kontakt library.
This write-up covers what the phrase likely refers to, legality and safety issues, and safer alternatives.
When searching for free libraries, users will typically encounter two types of results:
The Motif ES is a synthesizer, not just a sample player. A Kontakt library made from Motif ES samples suffers from several limitations compared to the actual hardware: