KMZ files: When .KMZ files wont open with Google Earth by default, there are two different ways you can try to resolve the issue.
1) Selecting Google Earth Pro as the default program One of the simplest and usually effective solutions for problems like this is right clicking on the respective file and selecting the option Open With. Next, users just have to choose the program that they want to automatically open that type of file from now on, in this case Google Earth Pro. This is done by completing the process with the option Choose Default Program. In case you want to try this yourself, but Google Earth Pro doesn’t feature in your default list of programs when the option list pops up, you can manually pick out the executable file for Google Earth Pro. This is done by navigating to where you have the software installed. Usually, you can ding it at C:\Program Files\ (x86)Google\Google Earth Pro\client. Here, you can find googleearth.exe and select it as the default program for opening KML and KMZ files. 2) Saving the file
Save the file to your downloads instead of opening it. Open Google Earth, on the taskbar on the top left, select File/Open navigate to the file, click ok.