SW category contains Dektec SW mostly dedicated for use in association with Dektec devices. In this case SW license is associated to adapter's Serial Number. You can check what licenses your adapters have by free DtInfo utility.
There are few SW modules, e.g. TS Analyzer Stream Xpert, which can work without Dektec HW devices, where license is provided at USB dongle (abbreviation DGL behind product model).
To install a Dektec licnse (.dtlic files), you can follow these Dektec guidelines.
SL, Stream Expert Lite is Light-weight version of StreamXpert for viewing and recording transport-stream contents, and for decoding audio and video. It can be used for majority of INPUT Dektec devices.