Can i update my site without losing the interface?

My site: and its a johncms 7.1 site.
i want to convert it to 9.2 without losing the interface. i meant designs and modules.
cool developer, who love to code on Johncms
The only way to do it backup your site database and file
then download latest johncms copy the folder install, forum, files, themes, system replace it to ur own n begin updates
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