Render Plus products are available for all SketchUp Products from SketchUp 8 through SketchUp 2019
See the IRender nXt - 3D Design Studio - ArielVision 2019 Release Overview for an overview of the great new updates included in the 2019 release of these products.
Your Render Plus License Status
You need to download and install your Render Plus software product for it to work with SketchUp 2019.
Please read the following to determine the status of your Render Plus Software license with regard to its use with SketchUp 2019:
If you have purchased or renewed your license in the past 12 months you can download the latest version and install it for use with SketchUp 2019. Download New Version
If your license is more than 12 months old you will need to renew your license before you can download the SketchUp 2019 compatible version. Renew License
If you have a SUBSCRIPTION license you can download the latest version of the software whenever you choose to move to SketchUp 2019.