As in the title, I'd like to know how to safest upgrade to paid version without losing data and settings etc.
I already tried to install over the free version, but no luck. So I uninstalled the old ver. and installed paid, but this has lost all my settings and does not seem to be the correct way to do this ether. I've looked through the forums, searched the pdf which came with the download, but here I am now... :)
I've restored the free version, so I can pretty much start over again with your help.

Thank you in advance.

Ok, got it. Just add your download ID in settings, check for updates, and done. Keep your old .css (and if edited other layout files) handy so you can easily restore the design.

One other thing (if someone needs pointers for upgrading to paid): Refresh the database in "Error Log" section and then payment methods show up, otherwise the list is empty, even though the plugins are enabled.

I am sure these pointers are written somewhere, but if you are anything like me - not really reading through the manuals unless it's the last resort, then this thread might help out a little. :)