Try the one for Windows 7.:)

From your description, what you need is an access point? Many TP-LINK devices can make it. Do you still need to access internet by cable to the access point? If yes, to purchase a router like...

What's your firmware version? Upgrade the latest one, reset and reconfigure it. Besides, is it possible to access the server in another way like web browser with http://LAN:port or http://WAN IP:port?

It has no bandwidth control function. QOS is used to make some specific application like IPTV or VOIP have the highest priority for the whole network.

TD-W8961ND cannot be used to extend range from your huawei device, which is limited by its chipset.

There are four lights on extender. How about Wi-Fi light? Can you try to connect to extender by cable to see if it works? If it is the same, try to reset them and rename them using utilty....