If you are an advanced SketchUp user, you may want to try the alternative quick method of migrating extensions by copying the contents of your old extensions folder to the new one where you want to move your extensions.

Be sure to check with the extension developer for instructions on how to do this as the process may be different for each developer. If you forget to do this, you can normally reset your license activations. Note that certain paid extensions may use a different license systems and require you to first remove the license from your old computer before activating the license on your new computer. If you purchased an extension from the Extension Warehouse, you must reinstall it from the Extension Warehouse from inside SketchUp in order to properly migrate your license. The ExtensionStore includes some tools for automating this process (if you originally downloaded the extension from the ExtensionStore) whereas with the Extension Warehouse, you can go to the ‘Downloads’ section to see a list of all extensions you have previously downloaded so you can easily go through the list and re-download the latest version of the extensions you wish to migrate.

To avoid compatibility, loading, or license errors, the recommended method is to reinstall the latest version of your extension by downloading it from the same website that you originally received it. How do I move my SketchUp Extensions to a new computer? Or move them to a new version of SketchUp?

Extensionwarehouse