You are downloading the Find the Subnets XAP file v188.8.131.52 for Windows Phone. Find the Subnets is a free and useful Education app: The user choose the ip address that want to create subnets. Next chooses how many hosts/router he wants to have every subnet and the application ... You can now download the offline XAP file to install & try it.
Download Locations for Find the Subnets 184.108.40.206 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 Find the Subnets XAP file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.