I'm not certain the new download updated my existing RadSol game on my laptop; my Games Won tally is still there, but no new options to toggle between 1 or 3 cards. Apologies, I'm not the most savvy with this stuff. But I'm LOVING this game!! Thanks!

No worries! Thanks for playing!

If you press F1 it should bring up a list of all the settings. If you don't see this, you may need to get  fresh build. 

Pressing F4 at any time will switch between 3 and 1 card at time modes.