Hello @maskah thanks for the note.
You can still use SketchUp 8 for commercial use, however, we no longer support your version of SketchUp 8 nor provide downloads. If you are interested in purchasing a license to get the latest version of SketchUp Pro for commercial use, please click here.
Since you have never had a professional license, you will need to purchase a new license for $590. We offer two types of licensing for SketchUp Pro. Be sure to review the hardware requirements for SketchUp before purchasing.
If you need anything else, please let us know. Thanks for being a part of the community!