Quatech QSU-100 Drivers go up to Windows 7 x64 & x86 but may work on newer OS.
Quatech USB multiport serial device Driver
File: Windows Driver - Quatech USB to Serial Adapter.zip
16b4d1abc4059b81bd87260cee063b08746f6d06419e33e0850cef04c19ac03f
Quatech QSU-100 Drivers go up to Windows 7 x64 & x86 but may work on newer OS.
File: Windows Driver - Quatech USB to Serial Adapter.zip
16b4d1abc4059b81bd87260cee063b08746f6d06419e33e0850cef04c19ac03f