If you have 3.3.0 and Blesta releases 3.3.1+ but your support & updates expire, you can still apply the patch however you can't upgrade to 3.4.x if your support & updates have expired. You will be given a Support and Updates error.
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To place an order for a Slave please go to your service row and click on "manage". After you will see where you can re-issue your SolusVM License, etc, click on "Change Configurable Options". You can then use the sliders to add slaves to your license.