Uninstall GameStudio A6.60 (a6.40 updated to a6.60), and download GameStudio A6.60 available on the Conitec website. The only problem is when you have the old key. If that's true? Then you must remove anything left from the GStudio6 directory, after you uninstalled GameStudio. Then first install your key from the compressed archive to GStudio6 directory and then install A6.60 from the download page.

To prevent installation errors: Shutdown the internet connection. Disable the firewall/virus application. Make sure you have administrator rights and then install GameStudio on your computer.