How to run Kexi's AppImage app.
1. For security reasons the file comes downloaded as non-executable. Make the downloaded .AppImage file executable by either useing the command line:
chmod a+x kexi-________.AppImage
or by using your graphical interface, e.g. see http://askubuntu.com/a/835051
2. Run the app from command line:
cd ____FILE_LOCATION____ ./kexi-________.AppImage
or by clicking the file's icon.