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At the first step we advise you to rename your current theme folder to something like: …/wp-content/themes/dt-THEME_NAME-old/. It will help you to save custom changes of the template.
At the next stage you need to install the theme in the usual way.
Remember you can choose which one of them will be set as the Homepage one by following: Dashboard >> Settings >> Reading >> Front page displays >> A static page (select below) >> Front page
Note 2 things:
So in order to update theme, you need to: