The installation of ITCM 14.6 on server 2019 failed with 1603 at the Manager installation.
First I tried to update from 14.5 (error 1603), then I uninstalled all and performed a clean new install. Same result: 1603.
The DSMSetupManager.log shows:
MSI (s) (A4:D8) [11:22:16:251]: Invoking remote custom action. DLL: C:\Windows\Installer\MSIEDD7.tmp, Entrypoint: ciMgrIPWrapInstall
Aktion gestartet um 11:22:16: ciMgrIPWrap.78E8F174_1816_4725_B294_CA905C6C6B9B.
1: ciMgrIPWrapInstall: Entered
1: ciMgrIPWrapInstall(): Tracing enabled
CustomAction ciMgrIPWrap.78E8F174_1816_4725_B294_CA905C6C6B9B returned actual error code 1603 (note this may not be 100% accurate if translation happened inside sandbox)
The DSMstartMgrIP.log shows:
Error: 7 -- ""C:\Users\USER_NAME\AppData\Local\Temp\{E981CCC3-7C44-4D04-BD38-C7A501469B37}\MgrIP.exe" -s"
Server 2019 with German language.
On this server the default program for .VBS files had been changed to Notepad++.
Change the the .VBS file opening program back to its default value of cscript.exe
Reboot the server.