The “offline” thing can be fixed but your license for SketchUp Pro 8 will not work to activate SketchUp Pro 2018. Your SketchUp Pro 8 license will only work for SketchUp Pro 8.
The “offline” thing can be fixed but your license for SketchUp Pro 8 will not work to activate SketchUp Pro 2018. Your SketchUp Pro 8 license will only work for SketchUp Pro 8.