Installing a program my mac says it is already installed but it is not

i am trying to install a program called autocad for a class i am taking. upon intallation i am promted that the program is already installed and that i need to uninstall before i can continue. i have never installed this before. why is this happening? what can i do? i have looked for all files called autocad on my mac. the only things that come up is what i have just downloaded.

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