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When trying to update wordpress from 3.1 to 3.1.1 I am getting the error

Incompatible Archive.: PCLZIP_ERR_BAD_FORMAT (-10) : Unable to find End of Central Dir Record signature

Some searching shows a cause of this can be that the servers disk is full. My disk is not full but it was about a week ago. I believe Wordpress has the disk still flagged as full and not writeable. Does that sound plausible or does any one have any other suggestions?

I have three Wordpress blogs on the server and this is only affecting one of them.

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Sounds like the upgrade download corrupted (probably because of disk space) - just do the upgrade manually.

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Thanks, manual upgrade worked just fine. I had not done that before but it was easy. – ollybee Apr 15 '11 at 14:00
Solved this finally... even after the manual upgrade I could no longer do automatic upgrades and found some other wordpress features failed. The site was on a Plesk server, I used the control panel to configure PHP as an apache module. I was then able to upgrade worpress. I then changd back to fast CGI and everything worked perfectly. – ollybee Jun 8 '11 at 21:14
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