i've installed Proteus 7.5 but when i tried to open it,it state that my proteus has the bad product key. i've tried to fix it but it still happens.I've already installed and uninstall couple of times but still the same.
Ask your lecturer. as far as I can tell, it is not free.
http/www.labcenter.com
now i can install it.but there is a problem.I can't place the component on Proteus board. When i try to place a component,it will disappear.Anyone know how to solve this?