You are downloading the ChatS XAP file v18.104.22.168 for Windows Phone. ChatS is a free and useful Social app: Encrypted Messenger - Communicate freely via the net, without prying ears.Chat with your friends securely and secretly by self-encrypted ... You can now download the offline XAP file to install & try it.
Download Locations for ChatS 22.214.171.124 XAP file
Important Notice: Now Due To Unspecified Limitations, You Can Not Use The Offline XAP File To Install It Any More.
To try to install it manually from an SD card, you should choose one of the server location above to get the offline ChatS XAP file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.