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Have you considered uploading it to 4shared.com? That way, everyone could search for it from that website without having to email you. It might put a little less strain on your inbox.
Don't worry, there are ways to it with Macs as well. Just go to apple's website and do a search for "the unarchiver"
Sorry, I'm not allowed to post links yet.
You're not the only person to have run into this issue.
Volumes 22 and 23 are RAR files instead of zip files. If you're using Windows, all you have to do is google "7-zip" and install that program. Then, you should be able to read those volumes.