You are downloading the Smart App Lock XAP file v18.104.22.168 for Windows Phone. Smart App Lock is a free and useful Utilities & Tools app: Smart App Lock-GooTile Hide & Secure your secret applications, pictures, private video clips, notes, passwords, todos, location, audio, secret ... You can now download the offline XAP file to install & try it.
Download Locations for Smart App Lock 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 Smart App Lock XAP file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.