Update to 3.4.7 stucks

Update to 3.4.7 stucks at “Initialize” with the message “Updater is loading”. “Next” not clickable, no further error messages, no entry in the server error log. Searched the community forum, did not find a solution. Please help.

you might want to check this thread out…

Thank you for your answer. I already red this thread before but I do not see any use for solving my problem. My database version is the same as my phplist version (3.4.6) and I cannot find any actions.txt file.
But I may try to update manually too.