And after the sim refused to start following my trying Dev mode with the latest SDK ( I got as far as starting a new scenery mod and the whole lot crashed) - after that I tried repair then reset - reset caused a full reinstall.
But that didn’t include the European sim update. So after a week of working fine (and that hotfix) I added the update in-game via my profile. But yesterday on the first time of trying after that it refused to load past the picture of Paris. I tried app repair and then reset. No use. So now I am having to do another complete download. A troubleshooting/reporting tool would have saved that because if I knew what was stopping all this - most likely something on my PC rather than what it then takes from 't internet - I could rebuild the files myself (like i used to with better running sims)