Is It Possible To Transfer The Theme From 4.0.1 To The Latest Version?


I am stuck with 4.0.1 version because when the 4.0.2 came out, upgrading messed up my whole theme.

I copied the main theme in design/themes in a new directory and worked on that altering files. Now the website is too slow, I hope I can count on the latest improvements but can't re-theme the whole thing.

Does anyone know if I can transfer the theme in any way? Because I think the onsite template editor files were also changed into .json from something else.