You are downloading the App Locker XAP file v18.104.22.168 for Windows Phone. App Locker is a free and useful Utilities & Tools app: This Application Is For All Those People Who Wants To Make Their Applications Password Protected. This Application Covers Leading Chat Applications ... You can now download the offline XAP file to install & try it.
Download Locations for App Locker 22.214.171.124 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 App Locker XAP file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.