launcher issue

Put the summary of the bug you're having here

What I expected to happen was...:
that the minecraft launcher to update files

What actually happened was...:
it was trying to download manifest things, and it gives me an error everytime and it doesnt open. ive tried repairing it, resetting it, redownloading it, etc. but nothing is working

Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. ...
3. ...