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Hello My internet connection (modem) is in my living room downstairs and I have a computer in my room, upstairs. The problem that I connect my desktop through WIFI but It is very weak. I do not want to use an Ethernet cable because it will be so long. What Can I use to get better internet signal? Maybe a Range Extender. Wi-Fi Booster like this : https://www.amazon.com/VICTONY-Extender-… Thank you

A pair of power line adapters would be a good solution. These plug into mains sockets and send the network traffic over your mains wiring. Very simple to set up and use and at least as fast as WiFi.