And orbit files are also affected:
WARNING: org.esa.s1tbx.sar.gpf.orbits.ApplyOrbitFileOp: error in opening zip file
WARNING: org.esa.s1tbx.sar.gpf.orbits.ApplyOrbitFileOp: ApplyOrbit ignoring error and continuing: java.util.zip.ZipException: error in opening zip file
Apparently, everything in snap that downloads a zip fails (it creates a corrupt zip file).