LaunchX ‑ Under Construction

Can you give minus stars? Spent a few hours setting my landing page up, followed all the instructions and then it doesn't work - just gives a 404 and a blank page on my site. Tried speaking to the developers on their "live chat", they just said they didn't know what was happening and hung up. I emailed them several times and no reply. Gurus from shopify said it's definitely an app problem. Don't waste your time with this app - their support is non existent and it doesn't work!