Sketchup 2018 download

Why is there not an Sketchup 2018 to download for use on your Computer?
I don’t like to use it online,because my Internet connection is not always working good.

There is, from the download page. Why do you think there isn’t one.

If you want to pay for it. Yes.

So you wanted a free Make version of 2018, sorry Make was discontinued after 2017. The 2017 Make version is still available for download and free non commercial use on your desktop.