As far as I know, you cannot install the skytest to another computer (it has a code, maybe it has a crack as well)... But based on my experience, and rumors of others, the FEAST is not cheatable and you cannot prepare yourself that much. What you can practice with the skytest, you can practice with other (free online) programs as well (read the Eurocontrol testing and interviews thread), but you cannot practice how to be stressed in this way...
Anyway you can write in English whenever you want, as it is a forum for people who want to be ATCs so should speak in English
If you did not mean what I answered, sorry for that but the translation was not perfect
Cheers