The repository has moved, and it seems like the script to install the drive has not been kept up to date, so you will need to make a couple of adjustments.
Launch a terminal from the applications menu and run the following commands (one line at the time):
sudo apt update
sudo apt install git
git clone https://github.com/ArynKumr/mt7902driverforlinux.git
cd mt7902driverforlinux
sed -i 's/Nevergiveup11837/ArynKumr/g' install_wifi_driver.sh
chmod +x install_wifi_driver.sh
sudo ./install_wifi_driver.sh