Unreal sketchup exporter installation problem

I have downloaded the unreal sketchup exporter. Tried to install it to my unreal 4.20 version and Sketchup 2017. It went smooth at the beginning but then when it comes to the page as in the attached screenshots, the installation window suddenly disappear and nothing more has happened. This exporter is simply not installed to my Sketchup 2017. What is the problem? Did anyone of you has experienced this? Thanks.