(1) Find the installer exe, right-click it and choose “Run as administrator” then choose “Repair”.
(2) Update graphics driver from …
a. your computer OEM
b. Intel directly (latest is 29-Aug-2018)
(3) There is a patch for 2018 to overcome the “slow select tool” issue …
(4) Did you have any external displays previously plugged into your machine, and if so had you set the external display to the the “primary” display ?
I myself had SketchUp hang when it was opening on my internal notebook display which was set as the “secondary” display when an external monitor was plugged in. It was a rigmarole to get things working correctly again.
(5) If you can get SketchUp running and get at the Preferences > OpenGL panel, switch OFF “Fast Feedback”. (It seems recent 7th and 8th generation Intel HD 6xx APUs do not like Fast Feedback.)