I have the same problem. I'm dloading the tar.gz on a mac. My hosting will only extract .zip files, so i repackage the tar.gz as a .zip and then upload to my hosting service. I do not have access to ssh. Clearly, the native os x decompressor is having the same issue as IzArc, since the error msg is exactly the same.
I don't really know how else to do this. I could get the latest from source control, but I'd feel more comfortable using the latest stable.
How can I get this to work?
Thanks!