You are downloading the 3DVu XAP file v126.96.36.199 for Windows Phone. 3DVu is a free and useful Education app: 3DVu is a simple 3d model viewer with a built-in model library. Supported 3D models can be downloaded locally and viewed offline.Currently ... You can now download the offline XAP file to install & try it.
Download Locations for 3DVu 188.8.131.52 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 3DVu XAP file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.