Because "802.11n" refers to a wireless standard rather than a specific brand, you must find the driver matching your hardware manufacturer (e.g., Realtek, Intel, Broadcom, or Ralink). RTL8811CU Software - Realtek
Here is why:
Windows 7 is (extended support ended in January 2020). Many modern drivers may not be officially available for Windows 7. However, if you still need the driver:
You can plug these IDs into a database like pcilookup.com or simply Google the ID codes. This will reveal the chipset manufacturer (usually Realtek, Ralink, or Atheros). Once you know the chipset, you can download the reference driver from the chipset manufacturer's site.
Only download drivers from the original hardware manufacturer’s official website or trusted repositories like Microsoft Update Catalog.
While this guide focuses on , you must know that Windows 7 is no longer secure. Microsoft stopped security updates in January 2020.