Paprika's version number can be found inside the application in the following locations:
iOS - At the bottom of the Settings pane.
Android - At the bottom of the Settings pane.
Mac - In the menu bar, under Paprika Recipe Manager -> About Paprika Recipe Manager.
Windows - In the menu bar, under Help -> About.
If you are unable to open the app, you can find the version number using these alternative methods:
iOS - Go to your iOS Settings -> Paprika. The version number will be listed under About.
Mac - Open Finder, and go to your Applications folder. Select Paprika Recipe Manager. The version number will be listed in the Finder window.
Windows - Open Control Panel, and go to Programs. Select Paprika Recipe Manager. The version number will be listed in the Programs window.