So, it there a installer of Development system for LabView 2015 SP1 on Linux or not? If yes, where to get it?
the download page only offers to download the "full IDE" starting from LV2018…
The questions are:
LabVIEW for Linux and Mac before 2018 had no license control whatsoever. As such the download never has been available to anyone but people who could proof to have a valid license. You need to contact NI support with proof of purchase to get such a temporary download. And yes it's going to be temporary. You get a link and the according file will be removed from the servers after some time, usually a few days.