OK. Step back here.
Clearly Google Earth Pro is not functioning correctly. It appears to be abandon-ware. There is only an Intel version and it is built with Qt. (For those that don't know, that's a really bad sign.)
But it is Google after all. The fact that they dump this stuff on the internet and then forget about it doesn't matter. It's Google! So now it's our problem, isn't it?
First of all, let's see if Google is simply confused or if it has actually done damage to your system. In the Finder, navigate to your "Users" folder. You should see "username". Does "username 1" exist too? Hopefully it doesn't.
Assuming "username 1" doesn't exist, here is how to fix it.
1) Make sure Google Earth Pro is not running. Quit it, if it is running.
2) Launch Terminal
3) Enter the following command in Terminal:
defaults write com.google.GoogleEarthPro KMLPath "/Users/username/Library/Application Support/Google Earth"
and press enter. I STRONGLY suggest using the "copy" feature to copy the above line instead of trying to re-type it. Don't worry about the colour, the forums software adds that. Your text will be all black.
4) Now enter this line in Terminal:
defaults write com.google.GoogleEarthPro CachePath "/Users/username/Library/Library/Caches/Google Earth"
and press enter. Same advice as above.
At this point, I should admit that I don't actually know where your "myplaces.kml" file actually is. I sincerely hope it is in the location specified above. If not, then none of this will work.