About Extension Center
Click the Sprites tab and click + extension at the bottom of the Blocks area.
The Extension center dialog box is displayed.
Extension Status
An extension is in one of the following states:
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1. Ready to go
On Extension center, if an extension is shown as follows, it can be directly added. 
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2. Update available
If an extension is shown with the icon 
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3. New extension
If an extension is shown with the icon 
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4. Extension added
If an extension is shown with Delete at the bottom, it is already added and you can delete it. 
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Add and Delete Extensions
Add an extension
1. Click Add at the bottom of the extension.
2. After being added, the extension is displayed in the Blocks area.
Delete an extension
Click Delete at the bottom of the extension on Extension center.
You can use Extension Builder to customize an extension and add it to Extension center. After updating or adding a device or extension, you need to restart mBlock 5 to enable the device or extension to take effect.