You are downloading the Wikipedia XAP file v220.127.116.11 for Windows Phone. Wikipedia is a free and useful Books & Reference app: ★★★★★ The best Wikipedia app on the marketplace ★★★★★ All Wikipedia on your ... You can now download the offline XAP file to install & try it.
Download Locations for Wikipedia 18.104.22.168 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 Wikipedia XAP file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.