Help with installation

Hello all, I need some help. I stopped playing for a while and I want to play again. But a problem came up when I wanted to start the game. Instead of opening the game it wants to install or update the launcher, which is abt 120 mb but whenever it gets to 70-80 mb remaining, it starts again or says that an internet problem came up. I tried reinstalling arc and the game but nothing worked. How can I fix this?