Looks like the website is down because the domain registry expired, the website is currently on a client hold, meaning it is down due to some kind of account/payment issue. Hoping this gets resolved!
I think the site is gone or down, just picked this up and I can't sign up on the site
Apart from that the app is ace and I was looking forward to using it
Look at the support section, there is a fix in the last page. I can't upload an update yet since RD is crashing at the moment but as soon as they fix it I'll upload the fix here. Thanks.