This is the most secure method. You can find original Realtek RTL8187 drivers

The Realtek is a legendary chipset, primarily known for its incredible long-range capabilities in adapters like the Alfa AWUS036H . However, because this hardware predates Windows 10, getting it to work on a modern 64-bit system requires a specific installation approach, as official support often stops at Windows 7. Best Sources for RTL8187 Windows 10 64-bit Drivers

archived here. Look for versions listed for Windows 7 or "later," which often function on Windows 10.

, the Alfa support page provides specific Windows 10 installation guides and legacy drivers.