I installed WinPcap (other than v4.1.1) on the PC, then installed the LE-580FX Window. After that, the operation of LE-580FX became unstable.
If you install LE-580FX Window (v1.5b003) without uninstalling WinPcap (other than V4.1.1) from the PC, LE-580FX Window may not operate. In this case, you have to uninstall the WinPcap and LE-580FX Window. WinPcap (v4.1.1) will be automatically installed when installing LE-580FX Window. LE-580FX Window(v1.5b003) works properly only with WinPcap (v4.1.1).