The open-source community has reverse-engineered the EM28XX drivers. While not the exact "4.0a" file, the drivers combined with AMCap or OBS Studio achieve the same result. For Windows 10/11, this is the modern equivalent of Version 4.0a.
If the audio drifts away from the video, try capturing the audio through your computer’s or Mic port instead of the USB stick’s RCA inputs. Grainy Video Quality usb dvr capture dc60 008 version 4.0a download