So somehow the installer ran, was not able to setup the container, and was not able to write the install log file. Were there any error notifications in the installer GUI? Did you have the 8.5.1 domain manager running when you tried to install the launcher?
It might be faster to contact Sonic Technical support.
No, I didn't see anything in the GUI and I did follow the instructions by starting the domain manager before moving to the Sonic Container Launcher step. And believe me when I say that I tried (way too) many times, even starting the SCL from a different machine while running the domain manager from my machine.
How can I contact tech support?
You should be able to open a support case at http://progresslink.progress.com/supportlink.