Changing the core of the WordPress Theme

Hello,
I would like to improve my Theme and change its core,
This is the template,

I’m afraid that customers who are already using the current version will not be able to update to the new version.

Who can tell me what is the right way to make a change to the core
without hurting existing customers?

Thank you

If you’re changing the theme for Commerce section, most likely it would be fine but you should check it on a staging server before publish it. You may need to work on the new theme after installation a bit as when you click " change theme " it won’t be ready as magically .

Hello,
My question was about changing code in an existing Theme
I mean replacing the CodeStar framework with regular meta box,
What is the best way to make the?

Thanks.

The best way is to leave it as it is. If it’s not broken, do not fix it.

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Thanks