You can no longer find the 2017 version on the primary NI "current" download page. Instead, you must head to the legacy repositories:
Newer versions are often subscription-based, but 2017 was available under perpetual licenses. download labwindows cvi 2017 hot
Why target 2017 specifically? This version was a "hot" release because it bridged classic CVI with modern C standards. You can no longer find the 2017 version
: Built-in support for GPIB, USB, Serial, PXI, and VXI instruments allows for rapid data acquisition without manual driver coding. download labwindows cvi 2017 hot