It won't work good, no matter which way I tried.
The last try was deinstalling most of the components in the 2.5 version and try updating with CMS Update.
Like all other times before a sql-error message appears and I called the joomla database fixing tool direct... so I could get access to the backend.
Then I discovered, that some extensions like com_tags was not installed. So I tried to reinstall J3.2.3 over CMSUpdate and everytime I try this, this message appears
Failed deleting joomla.zip
Refresh Manifest Cache failed: Extension is not currently installed.
Refresh Manifest Cache failed: Extension is not currently installed.
Refresh Manifest Cache failed: Extension is not currently installed.
Refresh Manifest Cache failed: Extension is not currently installed.
Refresh Manifest Cache failed: Extension is not currently installed.
I fixed the problem with com_tags and other extensions over the extensionmanager "discover" tool and installed these extensions there.
I fixed all permissions with admin tool, repaired the database, checked everything I found... but the error while reinstalling still exists. My fear: on the next update the error appears again and will cause several problems.
And Idea what this can be?!?! Thanks in advance!
PS: I did upgrades of several installations on the webspace... no problem at all! Only with this one!