Change to 4 columns

Hello! i have a problem! no, this great theme, but often one error – error connection to server then i try to customize theme! today i spend alot of time to load theme customiser! But i need one thing – change footer column count to 4! Dont need more!!! But – all day i try to load customiser…desabling plugins, try another browsers. One thing cant do – update wordpress (fear to broke old site plugins – right now i dont need this 🙂 )
Can yo tell me where i can change this feature in code? I know – one value change and i’ll happy! but cant fin where it is