There's only one version of the game and the one here is the most tested and up to date. There's an additional "
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" file on togs' patreon that you should drop in the game's "game" folder.
Mallory's scene is very easy to select if you pay attention to the story. You decide if you want to help milk her or not and you even get to call her Buttercup or a name of your choosing. If I'm not mistaken, there are two scenes with her, just not in this update.
About the calendar and phone menu not showing, it only occurs to me that you might be using the Transparent Textbox Mod which is incompatible with The Roommate because it doesn't have a specific section for the additional quick menu items. If that's the case, togs has already included a text outline in this version and you only have to drop a blank textbox.png file in the "gui" folder if you want the textbox to go away.