Update Package Install Failed
From Joomla! Documentation
Joomla!
3.6.0
Errors reported[edit]
After clicking on updading to Joomla! 3.6.0 via Joomla! Update component, under certain circumstances, Joomla! didn't properly download the file displaying this error message:
ERROR: The archive file is corrupt, truncated or archive parts are missing
Versions affected[edit]
General Information
This pertains only to Joomla! version(s): 3.6.0
What is the cause[edit]
How to fix[edit]
Clear manually the files located in your /temp directory (except the index.html file) and clear your cache (site and admin).