ISTA 4.39.20 update 4.42.30 via ISTA CONSOLE?

[aade]

So just looking at the DELTA sets, they are valid zip archives. I compared a few files from the SDP and the SDP DELTA archives and it seems it only overwrites the files with the DELTA archive. The goofy part is that the istapackage.zip.001..005 files need to be concatenated before they can be unzipped. I can't seem to make a spanned archive work with those files. Usually if you provide the first and last file, you'll have what you need to traverse a spanned archive. But for some reason it seems they've just zipped up a large archive and then split it into 5 files.

But I believe the DELTA files are cumulative. I don't have many iterations of DELTA files, but it would make sense that everything in version, say 3 also contains 2. A future version 4 would then contain 3 and 2 along with its own payload.