apparently i have it insalled without having it on my pc to use

i downloaded this  a good while ago but after this happend i gave up after about 2 hours of trying to fix it and after forgot about the app but i really do want to try it so anyway here is my problem 

i accidentally deleted the original app for my pc by just using the bin and now if i try to redownload it the just says it already downloanded though its nowhere on my pc

i tried to go into the settings on my pc and uninstall it form there but then it just says it cant find the file when i click on unninstall so i dont really know what the problem is