SetDirectory establishes the current working directory.  The software and notebook should be placed in that directory. Then, create a subdirectory of it, which should be called sampleLattices, and put the sample lattices in that subdirectory.

Quit

SetDirectory[NotebookDirectory[]]

Load the current Lax pair system software.

Get["LPSystemsPartialDifferenceEqsV2.m"]

LaxPairSolverUI["c:\\data\\Bridgman\\Software-06-21-2017\\", userInterfaceDebugFlag->False];