I found a link for SketchUp 2014 Make but not for Pro. If you need Pro because you’re using it commercially, you might try contacting SketchUp’s Sales department directly.
Keep in mind that Trimble is unlikely to sell you a license for 2014 Pro even if you find it to download because it hasn’t been supported for a number of years. In addition, some features–3D Warehouse, Add Location, etc. will not work in the old versions.