I notice you're asking about "Native Instruments B4 Free Download." I want to provide some important context:
was a popular virtual Hammond B3 organ emulator, but it has been discontinued for many years (replaced by Vintage Organs in Kontakt). It is no longer sold or supported by Native Instruments. Native Instruments B4 Free Download
Would you like recommendations for safe, legal organ VSTs instead? I notice you're asking about "Native Instruments B4