Windows 7 - We can't verify your subscription status

I'm trying to use LRC for the first time. These are the steps I've taken so far:

• Downloaded program
• Got stuck on 99.2% installation
• Restarted computer
• Was able to open program (so it appears to have installed correctly)
• Got "We can't verify your subscription status" error message
• Closed & restared CC
• Signed out/signed in to CC
• Tried turning off synched clock as per another thread
• Checked for credentials (there don't appear to be any)
• Completely cleaned off this install of CC & LRC, reinstalled
• Again, got stuck at 99.2%
• Opened LRC, got "We can't verify your subscription status"
• Tore some hair out
• Posted this