Personally, I’ve never had any more problems downloading an RTG casino than any other casino software.
As for recommended RTG casinos – the Vip Group uses RTG for their casino software, so that would be one recommendation.
Also, Play United and Club World have good player feedback. That’s CWC Affiliates and Earn United right here on CAP.
They both keep very much up to date on the latest slots games and should convert your slots traffic.