I had a windows user account name with an empty space in it that caused me problems so I had to change it.
Now the problem is the ue4 is still pointing to the old account path both for saving project than for building and launching.
Saving and building work fine but launching returns me an error, causing the automation tool to crash.
In the log I see it points to the old account folder so I guess the problem is there and I have to let ue4 know what is my new account, but I don’t know how
I would suggest uninstalling and re-installing the engine at this point to ensure all the windows related dependencies are refreshed. This should not cause you to lose any project data.