Launch your version of TIA Portal (V14 or newer). Retrieve the Project: Do not use File > Open , as this will fail for .zap14 files. Select Project > Retrieve from the top menu. Navigate to your downloaded file and select it.
Unlike standard project files, these archives must be "retrieved" rather than simply opened. Download ZA14 zip
A .zap14 file created in TIA Portal V14 can generally be opened in newer versions like V15, V16, or V17. How to Download and Use a ZA14 Zip Launch your version of TIA Portal (V14 or newer)