After the cancelled Installation i get:
An unexpected error occurred
An unexpected error occurred. Please contact your administrator.
Apache works like before.
I tried Install and Build.
Only with downgrade to 1.2.17 it works.
Help me please.
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Nach der abgebrochenen Installation kommt nur diese eine Fehlermeldung welche im englischen Text ist, Apache etc. geht wie davor, mit einem Downgrade funktioniert wieder alles.
Hilfe! 
You must never downgrade.... Give us access to your server.
If we ask access to your server, that is because we 're unable to reproduce the problem. That problem seem to affect many users but not us... Whatever 
The same thing. I can give you access using Teamviewer, see PM
I'm already in support. I'll treat requests for support each after other.
Sorry
I'm already in support. I'll treat requests for support each after other.
Sorry
No matter, I'll wait, BTW Apache works fine)
Edit your /etc/imscp.conf file and /etc/imscp.old.conf file. In both, disable SSL for the panel and service (change values from yes to no). Once done, rerun installer perl imscp-autoinstall -d. Then, when the update is done, rerun the installer to reconfigure SSL: perl imscp-autoinstall -dasr ssl
It seem that there is a problem with SSL on update. I'll figure out why and fix for next release.