i tried again to install, checking the file as you noted.
At first the install failed, this time showing me an error in post install script. Looking ad install.log (which i attach again, with new details), it appears that there are some bad format packages.
I unzipped the file with The Unarchiver (v3), so i downloaded the .zip again, this time unzipping it with osx default decompressor, and now everything installed without problem.
So it appears there is some issue with unzipping with The Unarchiver.
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