This is because Google no longer supports MSIE below v10. So if you have MSIE v10 or v11 installed, you can change the BROWSER_EMULATION registry key for "sketchup.exe" to 10 or 11, and the Google Maps warning will go away.
SketchUp installers for 2014 and below set emulation to MSIE 8.
SketchUp installers for 2015 and 2016 set emulation to MSIE 9.
The SketchUp 2017 installers sets MSIE emulation to 11.
See this post for some reg files that you can use to change the emulation setting.
Geo Location and terrain import error - #5 by DanRathbun
If you’re running Win7, I’d recommend updating MSIE to 11 with all the latest updates, and running sketchup.exe’s browser_emulation at 11. (Going forward, this will be best compatible with SketchUp’s web features like 3D Warehouse and Extension Warehouse.)