I had the same issue yesterday and it turned out the graphics card in my monitor will not enable Zwift. I was able to launch and use the app on my Dell without the monitor. Are you using a monitor? If not may be your graphics drivers on your laptop.
I have same issue and I am using laptop in dock with additional monitor. I tried updating all drivers and laptop without additional monitor, it still don’t start.
I have the same issue using Windows 10 on an Alpha Alienware. Everything worked fine until the recent update and now it keeps hanging or takes me through to the “log on” screen saying no courses available. I have uninstalled Zwift and will see if it that works and will post to the group. Otherwise, will be interested to see if there are any solutions.