Strange issue. Well, I did all my best efforts to help you, but unfortunately it seems there is something wrong at installation procedure or with your installer.

I suggest you to try the following steps, one each time:

1) Reinstalling the add-on using the REPAIR option, or;

2) Uninstall the add-on, clear all registry data [start > regedit.exe (run as administrator) > CaptainSim > 767CAPTAIN], restart PC and install it again, or;

3) If the problem persists, maybe your installer is corrupted. Clear all registry data as described above, restart PC, download the add-on again and try installing from the new installer:

Check-in to Your Profile > Select product > Extended Download Service > Get New Links;

4) Or if it still doesn't work properly:

Check-in to Your Profile then click Product Name > Customer Support > submit a Ticket.

Hope this help.

Pinatubo.