Thank's SUCCESS!!!
This did it!
Got installed UniLogic 1_16, and it is running smooth! ;-)
It all started as this:
Ran the installation-file "UniLogicSetup_1_16_Build_44_WIN7_SP1.exe"
After the WelcomeDialog appeared, I unchecked the checkbox-option "keep a copy of the old version"
As the installationprogram proceeded with uninstalling the old version, again and again,
I canceled that process.
So, I uninstalled the old version (1_15) from the control panel,
then I removed what was left of Unilogic in the program folder,
and so I traced up any listing containing "unilogic" in the registry and deleted it.
When I then ran the installation-file of 1_16 again, the story proceeded as mentioned.
But now, everything is perfect!
Thank's again for the super-fix-file!
/Preben