Hi,
Viveza appears to be the only plugin in the NIK Collection that cannot load ZIP-compressed TIFF files. It only loads uncompressed or LZW-compressed TIFF files. For 16-bit TIFF files, the LZW compression mode is irrelevant : 16-bit LZW “compressed” image files are most often bigger than the uncompressed original TIFF file. Since the other NIK plugins have no problem with this ZIP-compressed format, I don’t think that’s a licensing problem.
Anyway, this behavior should be consistent across all plugins.