Typo3 Update from 4.5 to 6.2

Reference Index
Go to the "Admin Tools" > "DB check" module and use the "Manage Reference Index" function.
Click on "Update Reference Index" to update the index in sys_refindex. 

News Symlinks to new 6.2_src
Dann das install-Tool aufrufen (http://meinedomain.de/typo3/install)

Dann upgrade-Wizzard.
Dann Database-Compare
Ebenso Folder-Structure und System environment

dam_falmigration über TER installieren

Alte Extensions:
require_once(PATH_tslib . 'class.tslib_pibase.php');
If you replace it with this code, it runs in 4.5 and 6.2:
if (!class_exists('tslib_pibase')) require_once(PATH_tslib . 'class.tslib_pibase.php');