To put it bluntly:

Follow these steps to install the full version of Curviloft in SketchUp. Step 1: Install LibFredo6 Open SketchUp. Navigate to > Extension Manager . Click the Install Extension button. Locate the downloaded LibFredo6.rbz file and click Open . Step 2: Install Curviloft In the Extension Manager, click Install Extension again. Select the downloaded Curviloft.rbz file and click Open . Restart SketchUp to ensure all toolbars load correctly. Step 3: Activate Your License

Draw the 3D lines or curves that define your shape. These do not need to be in the same plane. Select the Tool: Click on one of the three Curviloft tools.

Manually realign matching vertices between two contours if the automatic loft twists or deforms.

This tool fills a surface within a closed boundary of lines. Unlike the standard "Make Face," Curviloft can fill this boundary with a perfectly smooth, curved surface that behaves logically at the edges.

: This tool joins separate open or closed contours using smooth splines. It is perfect for transitioning one shape into another, such as a square base morphing into a circular top.

LibFredo6 is a runtime library of common functions shared by many of Fredo6's plugins. Curviloft cannot function without it. Log in to SketchUcation.com and download the latest version of LibFredo6 . 2. Install the RBZ: In SketchUp, go to Window > Extension Manager . Click the Install Extension button, locate your downloaded LibFredo6_X.Xx.rbz file, and open it. Then, restart SketchUp.

In the dialog box, you will see options missing from light versions:

To get the experience, you cannot just drag a random .rbz file into SketchUp without risk. Follow this official path: