Paprika 3 was released as a paid upgrade to the original version of Paprika in 2017. If you originally purchased Paprika 1 or 2 but have not purchased Paprika 3, you have two options:
1. You can upgrade to Paprika 3 by purchasing the current version in the Mac App Store. This will give you access to the new features in Paprika 3, which are explained here:
http://www.paprikaapp.com/blog/2017/11/14/paprika-3-0-has-been-released-for-ios-and-macos/
2. If you do not want to upgrade to Paprika 3, you can reinstall Paprika 2 using these instructions:
https://paprikaapp.zendesk.com/hc/en-us/articles/115004969713-How-do-I-reinstall-Paprika-on-my-Mac-