Because Windows 10/11 rejects unsigned drivers by default, follow carefully:

Are you trying to install this adapter on a (like 10 or 11) or an older legacy system ? Drivers - FTDI

The (specifically model 6D1320 ) is a classic 802.11g wireless adapter capable of speeds up to 54 Mbps. While it was originally designed for older operating systems, users often seek drivers to keep this legacy hardware functional on modern machines. Essential Specifications Interface : USB 2.0 Standards : IEEE 802.11g/b (2.4 GHz) Max Speed : 54 Mbit/s Security Support : WEP (64/128/256 bit), WPA-TKIP, and AES

The original driver package was designed for older operating systems, including Windows XP, 2000, ME, 98SE, Vista , as well as early versions of Linux and Mac OS X Internet Archive Archive.org (Manual and Context):

Long live the Wave 54.

Finding the correct driver for older networking hardware like the can be challenging because many official manufacturer links are no longer active. This 54Mbps wireless adapter was designed for the IEEE 802.11g standard, operating on the 2.4 GHz band, and was originally compatible with Windows 98SE through Windows Vista. Where to Download the Digicom 6D1320 Driver