LotAtc Client has no map, only blue screen

You have not select maps during installation. You can do that after, no need of reinstall!

1. Launch C:\Program Files\LotAtc\lotatc_updater.exe (default install path)
2. Check Add/remove components
3. Select at least Visual and Relief for each maps you want to use (in the following screenshot below)
4. Continue process with next, it will install everything
5. Restart LotAtc Client