You are downloading the Instabullet APPX file v220.127.116.11 for Windows Phone. Instabullet is a paid and useful Utilities & Tools app: Instabullet is FREE. Trial application and paid application are identical. If you want to support developer you can buy it. but it's your choice ... You can now download the offline APPX file to install & try it.
Download Locations for Instabullet 18.104.22.168 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 Instabullet APPX file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.