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Upgrade from 2.1.2->2.1.3 fails with message after downloading "Invalid AJAX data: Invalid archive type or extension in file"

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This is not a backup issue, 2.1.2 has been owrking fine. It is the upgrade that is failing. Downloads, but fails to extract.

Thank you
RogerCO

In case it helps anyone else - if you can manipulate files on your host, then after a failed upgrade you will find a file called update.zip in the folder "wp-content/plugins/akeebabackupwp/app/tmp". To save downloading a fresh version and uploading it you can simply move the file to "public_html/wp-content/plugins/" (that's the level above the akeebabackupwp folder) and extract it there - assuming you have the facility to extract in place files - not all ftp clients will do this, but if you have cpanel access to your host then file manager lets you do this.
This will overwrite the files included in the update package in the akeebabackup folder.

I can confirm that this time it doesn't seem to overwrite your carefully crafted configuration (for some reason last time I had a update problem the profile values got set back to default ones which was very unhelpful).

I guess you can safely delete the update.zip file once you have extracted it - or you can move it back to the public_html/wp-content/plugins/akeebabackupwp/app/tmp folder where I presume it will be overwritten next time an upgrade is downloaded.

Thanks Nicholas, take your point about not being sure of the version but if you do it straight after a failed update I guess you should be ok.

Useful tip about kickstart : Your text to link here...

I'll flag this as closed now in hope that the next update works seamlessly :-)

RogerCO