Question: Despite all the solutions I saw on the site, unfortunately my problem was not solved, I almost despair

[enter image description here](https://i.stack.imgur.com/M6MnO.png)

Answer: 
I can see "مشمس" word in your image that it means "Sunny"; so you are not using english regional format.  

Your problem is probably because of your system regional format.  

just set it to "English"  

You can see detail here: <https://stackoverflow.com/a/67554080>
Emulator is part of andorid-sdk-tools.

Emulator help to make virtual device, you can dowload it later in android studio.