You are downloading the Soundicity AppX file v18.104.22.168 for Windows Phone. Soundicity is a free and useful Music app: Control your Logitech Squeezebox devices with your Windows Phone!Soundicity supports local servers as well as www.mysqueezebox.com.* ... You can now download the offline AppX file to install & try it.
Download Locations for Soundicity 22.214.171.124 AppX file
Important Notice: Now Due To Unspecified Limitations, You Can Not Use The Offline AppX 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 Soundicity AppX file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.