If after downloading the product from Google Drive, you notice that not all files have downloaded, it’s likely that the download process may have been interrupted in some way. This can cause some files to be 'missing' despite them being in the Google Drive folder (and you still having full access to them).
As the file sizes can be large in some cases, an interruption in downloads sometimes occurs if the Internet speed cannot support the download of the entire folder.
In this case, what we would recommend is downloading the folder separately. Or if that is still causing issues, to relieve pressure from the download process, try downloading files individually (depending on your Internet connection) rather than the whole product at once.