Hi Biggs,
The new Layout Viewer will have many new features, the most important may be that you can start RTR directly with a selected layout, individual options and even individual ground textures. I hope it will be released very soon. But of course you can reinstall the old one in the meantime.
Anyway, Layout Viewer must be installed in the Rule the Rail directory, otherwise it doesn’t work. Please take also a look at the manual if you have problems.
Kind regards,
Willi