Upgrade to 2.6.1 -> error 500

[olih]

I want to upgrad. from 2.3.1.8 to 2.6.1. After using new wire directory and new index.php and .htaccess I get an internal server error at frontend and backend.

It seems to be not a .htaccess thing because I tried new htaccess with old wire directory and index.php and it worked without problems.

In error log there are following entries:

2015-09-14 09:46:25	guest	http://brandsandemotions.com/	SQLSTATE[42S21]: Column already exists: 1060 Duplicate column name 'name1011'
2015-09-14 09:46:25	guest	http://brandsandemotions.com/	SQLSTATE[42S21]: Column already exists: 1060 Duplicate column name 'name1011'
2015-09-14 09:46:25	guest	http://brandsandemotions.com/	SQLSTATE[42S21]: Column already exists: 1060 Duplicate column name 'name1011'
2015-09-14 09:46:25	guest	http://brandsandemotions.com/	SQLSTATE[42S21]: Column already exists: 1060 Duplicate column name 'name1011'
2015-09-14 09:46:25	guest	http://brandsandemotions.com/?/	Error: 	Exception: SQLSTATE[42S22]: Column not found: 1054 Unknown column 'pages.status1011' in 'where clause' (in /homepages/1/d349886895/htdocs/wsb6128438501/wire/core/PageFinder.php line 297)

I am not sure what to do to get the upgrade to work.

[LostKobrakai]

As the errors do state it's an issue with your database, which seems related to multi language. The first 4 errors are there because a column is already existing, while something seems to try to create it again, while the last one tries to access a column, which is not existing. 

[olih]

Ok, that sounds tricky.

If it is multi-language related maybe it helps to uninstall multi language support module while upgrading and installing it after?

Is this deleting all multi-language entries?

Other idea: Is it possible to make a new 2.6.1 installation and import content from existing database?

Ich danke Dir schonmal für die Antwort.