Ralink was acquired by MediaTek in 2011. MediaTek no longer hosts public legacy drivers, but they provided a final "Windows 8.1" package that works. You can find the on reputable tech forums like Station-Drivers or the official Microsoft Update Catalog.
It lacks support for 5 GHz bands and modern 802.11ac (Wi-Fi 5) or 802.11ax (Wi-Fi 6) standards, which limits its speed on high-end modern networks. ralink 802.11n wireless lan card driver windows 10 64 bit