It is not recommended to install drivers on an unsupported operating system as it may cause compatibility issues and system instability. If your wireless adapter is not supported by Windows 11, you may need to purchase a new adapter that is compatible with the operating system.
However, there are a few things you can try if you want to use your current adapter on Windows 11:
1. Check the manufacturer's website for updated drivers or software for Windows 11. If there are none available, then it is likely that the adapter is not compatible with the operating system.
2. Try installing the drivers in compatibility mode. Right-click on the driver installer, select "Properties," go to the "Compatibility" tab, and select "Windows 10" from the drop-down menu.
3. Use a virtual machine with Windows 10 installed to use your wireless adapter. This will allow you to use the adapter on Windows 10 within a virtual environment on your Windows 11 system.
However, it's important to note that using workarounds such as these may not provide optimal performance, and may cause issues with your system. So, it is recommended to upgrade to a wireless adapter that is compatible with Windows 11 for a better and more stable experience.