You are downloading the MathTris XAP file v22.214.171.124 for Windows Phone. MathTris is a free and useful Education app: A maths game to help sharpen your brain. Choose the right answer to move to the next equation, get it wrong and watch your container start filling ... You can now download the offline XAP file to install & try it.
Download Locations for MathTris 126.96.36.199 XAP file
To try to install it manually from an SD card, you should choose one of the server location above to get the offline MathTris XAP file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.