Hi Richard Warner,
The only way to upgrade the Community Edition website is by applying the patch for the standard Edition. The upgrades cannot be performed through the installer. There are functional differences between the Standard and Community editions. There are differences in the templates that are exposed in the project.
You can find more detailed information about how to upgrade a project at our Upgrade Instructions.
If you need only the data of your current project you can export it and import it into another project. You can do this from Administration >> Tools >> Export
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