Your problem doesn't have anything to do with activation or serial numbers. If it had, I would said so or asked about your order.
If you don't have the Couatl and GSX menus, the only possible explanation is your antivirus blocking the program, since you DO have the Addon Manager, and both requires the same VC++ libraries so, if one works and the other not, it's very likely the antivirus.
- Configure the antivirus to exclude the whole Addon Manager folder from scanning.
- Reinstall GSX again, using ONLY the current installer on our site.
If that doesn't work, perhaps you mistakenly denied Couatl from running when asked so, it's now "blacklisted" on your PC, because you said so.
To undo this, Uninstall GSX and reply YES to the question "Do you want to remove the Addon Manager?" that will be made when uninstalling. This will clear up any previous choice of trusting/untrusting the software you might have made inadvertently.
Then, reinstall GSX, with the antivirus properly configured.