It's not a problem with our product by any means, but as it dramatically affects our customers I have implemented a workaround.
To clarify, what happened is that whomever built the latest SHOUTcast2 and sctrans2 archives made a mistake and failed to gzip them when they tarred them up. But they named the file with a .tar.gz extension (which implies that gzip and tar were both used).
Since all prior archives had been tarred/gzipped, and because .tar.gz indicates a tar/gzip archive, Centova Cast's installer was trying to process the files as tar/gzip archives. That was of course failing, because the archives were not in fact gzipped.
Today's build includes a workaround that will actually analyze the header of any files downloaded from download.nullsoft.com and determine whether or not they are actually gzipped, regardless of whether or not they are misnamed as gzip archives.
On a side note, great to see you back, DrO -- thanks for your insights on the various threads popping up here!