old_contents: 
  from .util import geocode
  from .auxil import getAuxdata, gpt
  
new_contents: from .util import geocode
  from .auxil import getAuxdata, gpt, check_executable
  import warnings
  
  SNAP_EXECUTABLE = ['snap32.exe', 'snap64.exe', 'snap.exe', 'snap']
  
  if check_executable(SNAP_EXECUTABLE):
      pass
  else:
      warnings.warn("Lorem ipsum dolor sit amet, consectetuer adipiscing elit: http://step.esa.int/main/download/", 
                    Warning)
  
subject: Add executable check