I just downloaded the latest version of Unity and i got as far as signing in and loading a project, but since then it keeps closing when importing files, saying that unity editor has stopped working. how can this be fixed?
Sounds like you have a problem with your project. Try looking at the Editor.log file to find more information about the crash.
Note that, by default, Unity launches with the last project loaded so, if there is a problem with it, this could be causing Unity to crash every time the application loads. To prevent this, you can hold down “Alt” as it is launching, which will allow you to select a different project or create a new one.