Kontakt 5.7.3 is a powerful engine that allows you to play, edit, and create sophisticated virtual instruments. While newer versions exist, 5.7.3 remains a "sweet spot" for many users due to its stability and compatibility with older operating systems and legacy sound libraries. It serves as both a host for high-end sample libraries and a deep sound-design tool for those building their own instruments.
If you are looking for a completely free way to start, download the Native Instruments Komplete Start bundle. It includes the latest Kontakt Player and several gigabytes of high-quality instruments to get you moving legally and safely. Native Instruments Kontakt 5.7.3 VST Free Download
While Native Instruments offers a the full version of Kontakt 5.7.3 is a paid professional product. Kontakt 5
VST, AU, AAX (64-bit and 32-bit supported in this version). If you are looking for a completely free