So far i have tried : 

-Repairing the installation

-Changing the directory of the toolbox in the file settings

-Saving the settings

I have included some screenshots that show the problem. I also attached a screenshot of my toolbox directory and the

files inside of it. 

Could anyone please help fix this issue, i have an assignment due in a few days which requires quite a few toolbox parts.

Edit : i also added a pic of my add-ins , which doesnt display any toolbox options.

IMPORTANT Update ! : i checked the installation panel again thouroughly like someone suggested and it seems the toolbox cannot be installed. I tried to check the box , but it doesn't allow me to. I also can't change this or edit this. Photo included.