Upgrade from 2 worls demo - how?

[the-gilded-lily]

Have had no problem with Demo, quite far on in main quest. Have just installed full grogramme. Had to activate serial in safe mode (very small). Gets to start of new game and crashes. Cannot load saved games from demo. Both programmes are in different location and won't speak to each other. Demo still works fine but I can't advance. Do I have to uninstall demo first. There is nothing anywhere to help. Best wishes the-gilded-lily