Re-verify in Device Manager that your cable is assigned to a port between COM1 and COM4, and match that setting within the YDS software options menu.
is proprietary software intended for authorized Yamaha dealers and professional marine/automotive technicians. It is not legally available for free public download from official sources. Unauthorized distribution or use typically violates Yamaha's copyright and end-user license agreements. Yamaha Yds 1.33 Diagnostic Software Download