I'm trying to install a software called, Sigma Photo Pro, on my Ti Powerbook. I'm running Tiger 10.4.8. The software is packaged as a .sit file and I opened it with Stuffit Expander. Everything seems normal at this point, the Sigma Photo Pro installation icon shows up on my desktop, but when I double-click to actually install it, nothing happens. I didn't have this problem when I installed the software on my Mac Mini, nor my Aluminum PowerBook.
Any ideas on why I might be having this problem? I verified and repaired my disk permissions.
The software can be found as a free download here:
Sigma - Support - Downloads