Hello, Inno Setup is able to take a file which is out of the setup.exe and install it, so if they can distribute more then just one file, they can put logo.jpg etc. in the same directory (or a subdirectory, as in my example) and install would find it there.
[Files]
Source: "{src}\Licence\*.*"; DestDir: "{app}\Bin"; Flags: external comparetimestamp; Components: Licence