Solution
If you require the LabVIEW SoftMotion Module for your application, the latest version available is the LabVIEW SoftMotion Module 2020. NI did not release a 2019 version of the LabVIEW SoftMotion Module.
If you require the NI-Motion driver for your application, the latest version released by NI is
NI-Motion 18.0.
The
NI-Motion 18.0 Readme states that it supports LabVIEW 2015 or later. However, this should be interpreted as 2015 up until the publish date of NI-Motion 18.0. In other words, NI-Motion is compatible with LabVIEW 2015, 2016, 2017, and 2018. There will not be any new releases of the NI-Motion driver - NI-Motion 18.0 is the last version that will be released.