The free version of the game is labeled "CriminallyYoursBaseGame- 2.1" and only includes Nik's route. You'll choose Mac if you have an Apple brand laptop or pc, and Windows if you have a Windows laptop or pc.
"CriminallyYoursDLC-2.1" is the paid version of the game, which adds Wes route and full voice acting throughout. The PC versions are $4.99 USD, and the Android version is $2.50 USD; they are the same game.
If you downloaded the game and are trying to access the game file, you'll have to unzip the folder you need, extract the files, and the application will be available inside.
Hope this helps.