Open the model you want to convert in Sketchup. Open the "File" menu, then to "Export" and then "3D Model". In the new window choose "Google Earth4" in the "Export type" field. Name your model and click the "Export" button.
Rename the file you just created from name-of-your-model.kmz to name-of-your-model.zip. Extract the zip file to your desktop.
Download the FBX Converter for your operating system from Autodesk.com. Click on the link in the Resources section and scroll to the middle of the page. Install the software on your computer and run it.
Click on the "Convert to FBX" tab and click on "Add." Browse to the name-of-your-model.dae in the "Models" directory in the directory created extracting the zip file and click "Open." Click on the "Convert" button.
Click on the "Convert from FBX" tab, when the conversion is complete. Click "Add" and find the name-of-your-model.FBX file in the same folder as in the previous step. Click "Open." In the "Destination file format" select "3DS." Click "Convert" to have a3DS Max file.
