This is due to increased security settings on our backend. If you have a very old version of Paprika installed (v1.1.2 or earlier), you will need to update to at least version 1.2.4, which can be downloaded here:
https://www.paprikaapp.com/downloads/windows/v1/PaprikaSetup.msi
(Please make sure you run the installer after downloading this file. Once the update is complete, please verify the version number has been updated to 1.2.4 under Help -> About.)