I cant install Hamachi

Maybe not me but my friend.
He installed hamachi and it worked , after a day it completely wont open. We tried to reinstall Hamachi but when we started installing once more it just stopped installing without any error and anything.
Program installed but it didnt. There was no sigh of it anywhere. We searched for it when it should be but it wasnt there. We installed again and again but Hamachi simply wasnt installed no matter what.