how to build hise 3.03?

The version numbers are pretty meaningless. Just build the develop branch.

the steps in the github have been stripped to nothing

They've been simplified to 5 steps - https://github.com/christophhart/HISE#windows

there is nothing anymore only a video from 3 years ago

I made an updated video last year (although nothing has really changed)

https://www.youtube.com/watch?v=D3kthNOQ9_s

so what do i choose during install. which IPP,

You don't need IPP but if you are using it you install the OneAPI and if I remember correctly there is an option for OneAPI in Projucer (I explain it in the video I've included below)

@Christoph-Hart

can I build HISE with C++ 14? if not, is there a dedicated installation of C++ 17 I can add to macOS 10.13? what is the minimum target OS on macOS / iOS for this newest build of Develop branch? What is the minimum version of Xcode for building HISE?

Yes! That worked. I appreciate the quick response too. 💪