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Currently BtEngineSDK was released for Windows platform only. And the supported language of the scripting API in Unity Editor is C#.
BtEngineSDK contains the following files:

1. Behavior Tree/Forest Editor

BtStudio.exe

2. Unity C# library/scripts

BtEng/BtEngLib.dll
BtEng/BtEngLib.XML
BtEng/NewForestNode.cs
BtEng/NewTreeRootNode.cs
BtEng/NewDecoratorNode.cs
BtEng/NewConditionNode.cs
BtEng/NewActionNode.cs
BtEng/BtEngineDemoGUI.cs

3. Unity plugin dll

Plugins/bteng.dll

4. Demo forest and tree xml files

AForest.xml
ATree00.xml
ATree10.xml
ATree11.xml
ATree20.xml
ATree21.xml
ATree22.xml

The Professional Edition can be purchased from Unity Asset Store. The Ultimate Edition License can be purchased here, but you need to purchase the Professional Edition from Unity Asset Store before getting the license.

Item Trial Edition Professional Edition Ultimate Edition License
License GNU Lesser General Public License (LGPL) Unity Asset Store End User Agreement License (Unity-EULA)
Price $0 $35 Contact Us
Free To Download Based on Unity Asset Store policy Perpetual For All Release Versions All Platforms
Bt Studio Functionality Limited Access Full Access Full Access
Bt Unity Menu Functionality Limited Access Full Access Full Access
Bt Engine Scripting API Functionality Full Access Full Access Full Access
Maximum Total Forest Count Limit Per Forest File 10 50 Unlimited
Maximum Total Tree Count Limit Per Forest File 10 50 Unlimited
Maximum Total Node Count Limit Per Tree File 50 500 Unlimited
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