Since the era of file-sharing sites like RapidShare, Native Instruments has centralized its community-driven content. The Reaktor User Library is the official, free repository for thousands of instruments.
Download .ens files from the User Library. reaktor electronic instruments rapidshare
Because "RapidShare" was a file-hosting service that shut down in 2015, links associated with it are long dead. However, if you are looking to explore the world of Reaktor instruments (Ensembles), 1. Understanding Reaktor Ensembles Since the era of file-sharing sites like RapidShare,