You are downloading the RGB Color Mixer AppX file v22.214.171.124 for Windows Phone. RGB Color Mixer is a free and useful Productivity app: Combines red, green and blue in order to obtain a mixed color and display it's value in hexadecimal ... You can now download the offline AppX file to install & try it.
Download Locations for RGB Color Mixer 126.96.36.199 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 RGB Color Mixer AppX file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.