You are downloading the Threema Work XAP file v184.108.40.206 for Windows Phone. Threema Work is a free and useful Social app: PRIVATE USERS, this version of Threema is intended for corporate use, please use the standard version ... You can now download the offline XAP file to install & try it.
Download Locations for Threema Work 220.127.116.11 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 Threema Work XAP file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.