SNAP needs the original products, because tjey contain all metadata as required by the software.
You could still open the tif files and stack them in SNAP, but most operators wouldn’t work on this because of missing metadata.
But how come I couldn’t find the product in scihub.copernicus.eu? I tried filtering Sentinel 2, S2MSI1C, specific dates of ingestion/sensing, path/orbit number. The same product doesn’t come up.