I just love how he tells me to do exactly what I've obviously been doing all along... We are listening, and we are trying to help - but communication requires listening on both sides. My only guess at this point is that there is a 7z decompressor on his system different from the default utility, and that decompressor cannot handle the CS5 files for some reason. Last I heard, the installer team was looking for a system with the problem so they could reproduce it and determine the cause. (because stock systems, and even our dirtiest work system, don't show the problem) BTW - checksums are not foolproof. Checksums/hashes try to reduced a huge file to 1 number. Many different possible files could give the same number, so it it possible to have a corrupt download with the correct checksum. (in fact, this is how some encryption hacks work) The Akamai downloader, and the Adobe installers all check the file length and checksums and report bad downloads. But, again, they aren't foolproof. And if something causes a valid download to decompress incorrectly - you will still get errors.
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