Since middle of the year, the collection S1 COG is available on the Copernicus Dataspace.
For now, SNAP doesn’t seem to handle those products because a compression issue:
org.esa.snap.core.gpf.OperatorException: javax.imageio.IIOException: Unsupported compression type (tag number = 50000)!
Is it planned to handle them ?
NB : It may be related to this issue