This happens to me everytime i need to patch the game (for years now). It stops your download and closes the launcher randomly and without warning. But if you restart it, it will try and pick up where it left off. I've had to babysit the download closing and opening it countless times. i've tried every solution you can find on google but brute forcing it was the only way ive ever been able to download the game. DNS altering, port forwarding, Even bought a VPN and it still happens.