You are downloading the Vigenere Cipher AppX file v18.104.22.168 for Windows Phone. Vigenere Cipher is a free Education App: Encode and decode messages using the Vigenere Cipher. Simply enter a keyword or keywords, a message and hit the encode or decode button. ... You can now download the offline AppX package file to install & try it.
Download Locations for Vigenere Cipher 22.214.171.124 AppX file
To try to install it manually from an SD card, you should choose one of the server location above to get the offline Vigenere Cipher AppX file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.