You are downloading the Chess Clock AppX file v220.127.116.11 for Windows Phone. Chess Clock is a free and useful Productivity app: This chess clock keeps accurate time and supports 8 time controls so it can be used for most two player board games including Chess, Go, Checkers, ... You can now download the offline AppX file to install & try it.
Download Locations for Chess Clock 18.104.22.168 AppX file
Important Notice: Now Due To Unspecified Limitations, You Can Not Use The Offline AppX 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 Chess Clock AppX file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.