Checking for Windows update takes forever

In Control Panel, I clicked the Check for Updates button and it took forever. According to https://www.youtube.com/watch?v=WFfc22x3I_s, there are 4 methods. I think the 4th method is the best but it might be affected by the previous methods too so you might need to do all the methods orderly.

1. Run Command Prompt as Adminstrator and execute the following command:
> ipconfig /flushdns

2. Download and install Windows Client Update based on your machine architecture (32 bits or 64 bits). Type the following command in the Comand Prompt to see it:
> wmic os get osarchitecture

3. Stop the windows update service by running the following command adn then download and install Windows Update Diagnostic
> net stop wuauserv

4. Install Windows update offline by downloading it from here http://download.wsusoffline.net/ and run it then:
- Under Windows tab, select "x64 Global (Multilingual updates)" checkbox
- For Options checkbox, select "Include Service Packs" and "Include Windows Defender definitions"
And then click Start button. It will start Command Prompt program and download the necessary updates.
- Go to the installation files again and then client directory and run UpdateInstaller.exe. When the program starts, check Automatic reboot and recall checkbox and click Start button.