When you have installed both you only need to click on the game in the download list (or in the folder in which you have saved it) and then on the folder with the name of the game you should look for the type "application" and this simply just start
No, I also had my problems with this quest. You have to be in the living room at 5 p.m. on Saturday, but it hadn't done anything for me three times so just keep checking whether it starts