MS Windows
Download and execute the Thea for SketchUp installer from the Thea Render downloads area or the Altair One Marketplace.
macOS
Download and execute the Thea for SketchUp installer from the Thea Render downloads area or the Altair One Marketplace.
Make sure that SketchUp was started at least once before running the installer; otherwise it won't appear in the list. The installer will guide you through the necessary steps. It automatically recognizes previously installed SketchUp versions and offers the corresponding plug‐in installation.
After installing the plug‐in, open the license setup window from the main menu: Extensions > Thea Render > License Setup.
Lease Licenses
If you have a Lease License, switch to the Lease tab and use the Altair One credentials (username & password) to get a license from the server.
Educational Licenses
If you have an Education License, then switch to the Node-Locked / Educational tab, click on the Browse button and select the license file (.dat) that you received from the Altair University.
If you do not have one, click on the Register button and fill out the form to receive a one-year Educational license from the Altair University.
If Thea for SketchUp v3.5 is installed over v2, then a Thea Switch option will be visible in the Main Menu allowing you to switch between the two versions (v2 & v3.5).
Go to Extensions > Thea Switch and select the version that you would like to switch to. Restart SketchUp to apply the change.