If you are already a subscriber, you will be able to activate with your username and password every installation you make of the software. If you are not, you can activate it for free up to 10 teachers during 15 days.
Use your username and password to obtain or modify a subscription to GHC from this website. Those computers that are already activated will be automatically updated, if you are connected to the Internet, with the new conditions of your subscription. This way you can continue working with the same installation and data.
The software is compatible with any version of Windows from Windows 7 onwards. Through emulators, the software works with the rest of the systems: Linux, Macintosh, etc.