You will get 2 files a blender file for example and a zip the main Addon file.
Download the ZIP file.
Open Blender.
Go to the Edit menu in the top bar, then select Preferences.
In the Preferences window, navigate to the Add-ons section.
Click the Install... button at the top-right.
Locate the ZIP file you downloaded, select it, and click Install Add-on.
After installation, find the "3D Comparison Tool" in the list and tick the checkbox next to it to enable it.
Return to the main Blender interface (the 3D Viewport).
Press the "N" key on your keyboard to open the sidebar on the right. You will see a tab named "Comparison Tool". Click on it to start.

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