Have you restarted your PC and tried again?
How did you get it to complete last time?
Asking because the forums seem rather quiet about it so it does not seem to be a wide spread issue.1
Have you created an actual tech support ticket?
Often issues that are not wide spread are a local issue or it is an issue along the internet. If I seem to not understand it is because you really are not saying anything that sheds light on the subject.
Close the launcher and install a free vpn (I personally used Windscribe when I had the issue with the launcher). Connect to the vpn and then start the launcher. After the launcher finishes downloading and installing the patch disconnect from the vpn so you don't eat up all the free bandwidth. This fix only will work if the launcher is giving you woes even when coming from a fresh install.
Close the launcher and install a free vpn (I personally used Windscribe when I had the issue with the launcher). Connect to the vpn and then start the launcher. After the launcher finishes downloading and installing the patch disconnect from the vpn so you don't eat up all the free bandwidth. This fix only will work if the launcher is giving you woes even when coming from a fresh install.
I did till now. I'm getting sick of adding vpns