Is there a way to save all settings in theme options because i changed lot of stuff including colours and i dont want to loose all that when i upgrade theme to newer version? Thanks.
You should always make the theme you customize a child theme of the actual theme then all you have to do is update the main theme and merge changes and your customized theme stays intact.
All i see is proper instalation and upgrade. I cant find anything with "i made mistake and edited original theme". Can i fix this or i need to delete everything and follow instructions above?