If you are seeing this error
Fatal error: Cannot redeclare pclziputilpathreduction() (previously declared in...blahblahblah
Please deactivate - then delete the
WordPress Automatic Upgrade Plugin
Since ver. 2.7, this is built in and the plugin will conflict with the install.
Also, once again a reminder to deactivate ALL plugins before upgrading manually as this is causing a lot of install errors, also.