That's strange, I haven't heard of anyone else having these issues. I would go to the games home page and try downloading it again. The only available download is the newest version. Trish's office is available from the very beginning of the game; you have to be in the main club room (where you can dance and run drinks), and there's a button on the left-hand panel that'll take you to her office. To open the save/load menu you can just right click and that should bring it up (default renpy behavior). If you see save load quit from the settings button at the top that almost makes me think you're playing the old unity version somehow. The immobile hub unlocks naturally through gameplay once you reach a certain size and you will have a storyline that automatically plays for you so you really can't miss it.