Because of my organisational blindness I missed a bit of code to change and a typo in the SQL code for the installation script. It was reported yesterday and the reporter and the team works on a solution. Thatswhy it is possible to update to the version 22.214.171.124 from versions 126.96.36.199 or 2.4.20 (Please do it with a testing installation but not with your live system!) but it's impossible to do a fresh installation of version 188.8.131.52.
Trenne niemals Müll, denn er hat nur eine Silbe!