I'm having all kind of issues with my A3000D (68040) running AmigaOS3.9.
It took me all morning long to install MUI38 (as part of my configuration of Rapid Road; this will be a new and separate thread). For some reason, my Unarc is chopping the files during unpacking, so at the end I had to use lha.run command.
Now, I am trying to install the Boing Bag updates, but I can't get the installation script even started. See attached screenshots of SnoopDOS log. It says that the Installer fails.
As part of my morning adventure, I made a fresh installation of Installer43_3, which now resides in C: In that folder I have Install still in C:
See attached pictures for illustration:


And these are the pictures of the error messages I get trying to install Boing Bag 1:


How can I fix this mess, fixing Unarc and straighten up the 3.9 defaults to handle unpacking and installation?
Thank you.