My update from 7.6.2 to 7.7.0 is done.
While running the installer a problem with the automatic language files modification comes up again. This screen say it update my german strings but never finish. The continue button don't come up. I have to use browser back, click 'I do my own modification' to continue. Then the update continues and finished without another problem.
After this I review my german files and see that the installer do it and modify my files. I only need to translate it. I use beyond compare to check all strings against the english pack but nothing is missing. There must be a little bug in the installer if you use more then one language packs or its my server - dont know.
After this all works fine und I change my php Version to 7.2 without a problem. Good work
One little thing I note while reviewing all files: the version strings are not all set to 7.7.0. Most of the files stay at 7.6.2 or older.