Opening up RStudio after download

I am trying to figure out this RStudio. I have to download it to use for my statistics class. I am very new to this and have never used it before. It doesn't seem to just open after I download it. I installed r first and then RStudio. I pinned the RSudio app to my task bar, but when I press it to open it to use it says that I have to reinstall it. I have reinstalled it like 3 times and it doesn't seem to work. I would appreciate any insight and simple instructions. Thank you!

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