@TNTHM You will install IPP directly, there is no custom installation folder for it.
Did you Enable the IPP before compiling Hise? In the latest Hise release, the IPP is disabled, you need to enable it in Projucer project file, before compiling Hise.
Check this video by @d-healey
https://www.youtube.com/watch?v=zeLeCSNh0XM