what do you mean by they wont open? sometimes it takes a long time for them to start up, because they are over a GB and it takes a couple minutes for them to open. double click them and just let it go for a little bit and see if it opens
How long did you wait? for me, it can take up to 20 minutes for the Installation "Cancel or Allow" prompt to show up. ive never gone looking for a solution, i just dealt with it.