No official driver from Realtek for modern macOS (10.15+). Use HoRNDIS (no – that’s Android tethering) or Wireless USB Adapter Clover driver. Legacy support: OS X 10.6–10.11 can use Realtek RTL8192CU driver from Realtek’s legacy site (v5.0.1).
Because "OT-WUA950NM" is a generic model produced by various manufacturers like Laptrix Technologies or MarkBase , you won't find one single "official" website. Instead, use these reliable methods to get the right software: 950m wireless-n mini usb adapter driver model no ot-wua950nm