norwegian69 I don't see the issue in backend of your site now, could you clarify steps by steps so I can replicate it?
Error when update Joomla
I click the button to update Joomla, follow the instructions and get the error message. (I have a backup)
See attached explanation
if you are on 4.4.3 try to rewrite all joomla files of the same version
once you have done try again to update to 4.4.5
Hello, Tried rewrite now but getting the same error.
norwegian69 Could I give it a try?
Yes you can
5 days later
saguaros Did you get a chance to look into this?
norwegian69 I can replicate the same error, something went wrong with Joomla package on your site. I will check with our developer if we can be of help in this case.
saguaros Ok, thanks
2 months later
Hello,
any feedback from your developers?
5 days later
Hi, norwegian69
I have conducted tests and identified that the error was caused by the Akeeba plugin: System - Backup on Update. Please disable this plugin and proceed with updating Joomla core, and your site will then be running the latest Joomla version.
Regards,
Wow you are good!
Thank yo so much 
saguaros locked the discussion.