Good to know about the update
The update will not cause any disruption to the online store, as it will be done in several stages. For practical instructions on how to perform the update, see below.
The old version will be kept safe, and you can always revert to it if necessary.
The update does not always automatically copy the changes made to the theme. In larger updates, the theme will revert to the default settings, and in smaller updates, the changes you make will be copied automatically.
Changes made to the theme's source code are not copied. You should copy them manually from the old version of the theme and check that the changes work correctly in the new one.
Installing and checking the update
Go to Online Store > Themes.
Click the three dots under the theme you are using and select Update.
Once the theme has been updated, it will appear in the theme library, and from there you can:
Preview the updated theme by clicking Preview on the menu.
To edit the theme, click on the Edit button.
Check that the new updated version looks and works as intended.
Deployment and release of the update
Once the update is done, you can deploy and publish it. This is done as follows:
Click the Publish button under the theme.
A new button will be displayed on the same spot.
Click the new button to make the theme public in your online store.