How to change your server type ?
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Stop your server
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Go to: Instance → Configuration → Minecraft
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Open the “Server and Startup” tab
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Select the desired option in the “Server Type” field
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Make sure the server is still stopped
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Click “Download / Update” to install the new server type
Important:
Some server types require a specific Java version.
To change Java version, see the following article: How can i change the Java version ?