Download and install DK3WN's software and OCX.zip etc. Install vb6sp6 or vb6rt340 for MSCOMM32.OCX, MSWINSCK.OCX, and MSCHRT.OCX etc from the other web sites. How to run Softwares in Windows8.1(64bit) http://www.ne.jp/asahi/hamradio/je9pel/mix3win8.htm JE9PEL, Mineo Wakita