I've downloaded the client and RoRLauncher.exe, made sure RoRLauncher was in the main folder with War.exe, added exceptions to my antivirus and firewall, made sure read-only was not ticked etc. But I cannot get RoRLauncher to run.

If I've figured out linking images correctly, the above should show you the error message I'm getting. I have tried looking at the three files listed but it's double-dutch to me.
If I'm being stupid I will happily take any amount of abuse thrown my way as long as it is accomanied by advice on how to actually get this to run.
Thanks in advance.