In IE11, can you get to Add Location to see the map? If so, can you get to Google (no country redirect), as that’s what we use to determine if you’re online. Search forums for other solutions, as other networks have experienced this.
When you try to install SketchUp are you an administrator ?
Select the installer file’s icon and right-click and select Run as administrator…
Did that help ?
If you have the SketchUp.exe can you select it and use the right-click > context-menu > Compatibility… have you ticked the check-box hear the bottom of that pane to always run this program as an administrator ?
Is your IE11 Internet Options set up as as to be NOT too strict in its security [around ‘average’?] - overly strict regimes can cause issues…
OK, then if PC, confirm you can (if you’re in English version) hit Google in IE? If you cannot, you need to edit the file C:\Program Files\SketchUp\SketchUp 2015\Resources\en-US\i18n.dat and change the ONLINE_TEST_URL to some site you CAN reach.