In order to play Where In The World Is Carmen Sandiego, I emulated System 7.5.3. with BasiliskII in Mac OS X, then updated to System 7.5.5. without much issue.
As I am trying to install the game I found on MacintoshGarden, I encounter the following error :

I don't really understand what's the problem there :
- QuickTime seems to be correctly installed in my extension folder
- I draged and dropped the QuickTime powerplug provided in the dowload file, from the Unix folder to Macintosh HD, then to the extension folder, and then I restarted BasiliskII
I looked up the error code but couldn't find anything related.
Do you know what I could try to install and launch the game?
Thank you very much in advance!