Some 10min later it was ready & run, didn't know about X# (as was to be expected), so re-ran the beta 9 installer. Restarted VS, noticed some complain about JAVA missing (!?), but let it produce a WPF app from X# template - voila. Great!
Getting adventurous, thought, i might easily get rid of my 2015 install - yes Chris, should know better than to try - so: Control Panel, "Change" - Uninstall, ran smoothly for some minutes, then "completed". Back to desktop still saw my link icon to 2015... - hit it, argh, what starts, VS 2015. Ahem... A quick google for "uninstall vs 2015" leads to tons of hits, folks looking for help, after fighting for days to cleanly remove this nightmare.
Probably it's better to dismiss with the GB it has eaten and ignore its existance
![Wink ;)](https://dt9qzg9h465rt.cloudfront.net/phpBB3/images/smilies/icon_e_wink.gif)