It is comparing the sha1hash of the file its downloaded which does not match what it used to be, so it won't install it.
Last time I encountered this it was because upstream (That would be google in this case) modified and re-released the package with the same version number, meaning its not the same file as it was before so the hash is obviously different.
sha1sum:
What it was ab368e740757f2178c5d4f85fc7f9872a70af8a9
What it is 206cbdb66d5a726b80e15125524f257cb03b620d
It was modified recently (It was released June 20, 2018)
Jan 25 09:10 google-earth-pro-stable_7.3.2_amd64.deb
