I added "install instructions" below the "download" section for questions such as this one
As for starting over, depends really if you like to experience the game for the second time, what really changed is the peeptube overhaul - some upgrades were moved from the default shop to the peeptube shop and you don't get credits for the night anymore, instead you get PP which you convert to credits
Imo there were no such major changes that would require starting completely from the beginning