You are facing the issue as you are uploading the incorrect zip.
You don’t have to directly upload the zip file which you have downloaded.
1. First, Extract the downloaded minivet.zip file.
2. You will find the “Demo Data” folder and the “Theme” folder in it. Open this “Theme folder”.
3. Here you will find the actual installation zip file i.e minivet.zip. Please upload this zip file while installation.