I had the UK version installed. Uninstalled it and recently installed the US version.
Launcher hangs on examining game data, it's clearly a conflict between the two versions (I found someone else who had the same issue - he solved it by installing on a second PC, which isn't an option here.. and really wasn't even a solution to the problem).
I've uninstalled both version atm and manually removed the registry entries and all related folders to the UK and US versions, hoping for a clean install entirely; but I probably missed whatever it is that's causing the conflict.
Advice? Information?
I'll let you know if I resolve it on this install.