A really strange issue.

1) I suggest you to uninstall the add-on and clean all register data:

Uninstall > Delete all CS C-130's register data [start > regedit.exe (as administrator) > Captain Sim > C130XPRO > delete all files (Standard/FLT/RegCode/RegName/support/tpl/version)] > Restart PC > Reinstall.

2) Or maybe your installer is corrupt. Download it again and try installing from the new installer:

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

Hope this help,

Pinatubo.