Hi. I was wondering if this was reolved and whats the solution? I have a similar problem when trying to migrate my website (using mamp) and running installer.php on my localhost I get the same info:
0B
The archive file size is currently 0B and its estimated file size should be around 386.72MB. The archive file may not have been fully downloaded to the server. If so please wait for the file to completely download and then refresh this page.
This warning is only shown when the file has more than a 10% size ratio difference from when it was originally built. Please review the file sizes to make sure the archive was downloaded to this server correctly if the download is complete.
there is also a comment ‘Unable to validate format’.
Obviously, I checked the files all in the folders and add up to 386mb..
this is really strange..