There are two versions of the SketchUp installer, a version which requires an internet connection usually you have that.
But there is a larger installer which includes all of supported languages which will allow you to install without an Internet connection. You can try with this one:
https://download.sketchup.com/SketchUpProFull-2022-0-354-126.exe
Don’t forget to right click on the downloaded installer and choose Run as administrator.
(BTW. this apply to both kind of installer)