Windows .jar Cant Download any Modpacks or update Them

[Savage]

OK, here is my problem
Every time i try to download or update the any mod pack it will say error cant download mod pack

can anyone help me with these problem?

 

[UniZero]

Follow the steps here to ensure that the launcher is installed the correct way.

If after doing those steps and you still have issues then go here for help with logs.