Hi Norman_Stansfield,
to use Octane V2018.x and above you would purchase OctaneRender All-Access Extension $199 (1 Year) - $399 (2 years)
https://home.otoy.com/render/octane-render/purchase/All-Access to the Industry's largest DCC plug-in ecosystem Octane 'All-Access' Enterprise subscription plans, beginning in Q1 2019, can access multiple DCC plugins from OctaneRender Studio - including Maya, AutoCAD, Revit, Houdini, Blender, 3ds Max, After Effects, Nuke, Unity, and soon, Unreal Engine.
All-Access to Extra Rendering Power
For perpetual licence/enterprise customers, All-Access plans further grant a secondary render slave node plus access to the ORC cloud rendering service.
All-Access to the Future
Get continuous access to all future updates and new features beyond OctaneRender 4, including NVLink (available in Octane 2018.1) and full Vulkan-RTX hardware acceleration on Turing GPUs coming in Octane 2019.
Regards
Paride