Linux Google Earth Pro is available at no charge. Download Google Earth 64-bit .deb or direct link and install:

gdebi google-earth-pro-stable*amd64.deb

Open from Google Earth menu icon, or from Terminal:

google-earth-pro

which is a softlink under /usr/bin/ to /opt/google/earth/pro/googleearth

This also installs a software source in /etc/apt/sources.list.d/google-earth-pro.list for automatic updates.

As noted in Google Earth release notes, the key improvements include:

• all Google Earth installs are now “Pro” for free
• high-resolution (Hi DPI) support
• fixed broken networking system (blank links) etc.
• works with new Google Photos layer (that replaced Panoramio)