Version 66.0 was among the final releases to support Windows 7.
Some users attempt to find older .exe installers for Windows 7. google drive for desktop windows 7 ultimate 64 bit
The most reliable way to manage files on Windows 7 is through a web browser. Log in at drive.google.com. Version 66
Using has become increasingly complex as official support has ended. This guide explains the current status, how to manage your files, and the best workarounds for users still on this legacy operating system. Current Support Status how to manage your files
Even if you have an older installer, Google Drive often forces updates or displays "obsolete version" errors that prevent synchronization. How to Access Google Drive on Windows 7