Thanks Paul.
I installed it numerous times, as I tried base J6, then wanted to try the Helix ultimate pack, and tried the starter pack on to the base J6, not realising it also contained a J6 install, so I nuked everything and started again, then tried a few things, but at the end, wanted a fresh as possible install, so now have a new db and the J6 install with helix ultimate.
Background is, I had my site in J3, with page builder, but page builder updated beyond what J3 was capable of supporting (php version wise). I neglected it for ages, so I feel like a bit of a noob getting back into everything joomla and page builder!