It looks like the file association for .algo files is corrupt on your PC, you are choosing the suggested app which is the MT4 setup program. Instead, you should select the option Choose an app on your PC, look for the cTrader EXE and select this.
If this does not work, you will need to contact Spotware support to help you fix this.
In the meantime you can still install the cBot into cTrader by following the instructions below for copying and pasting the file into your cBot Robots directory, full instructions are below for the directory option.
https://help.clickalgo.com/ctrader/install-cbots/