wave-amp installer

--Installer made by AlexZapl for LevelOS--
--I don`t own any rights for wave-amp2 or its api`s--

if fs.exists("/Program_Files/wave-amp2/wave-amp2") and fs.exists("/bbpack") then
    print("You have already installed wave-amp2 and all needed files")
    print("Do you want to install common song library? Yes/No")

    local answer = io.read()
    if string.lower(answer) == "da" or string.lower(answer) == "d" or string.lower(answer) == "yes" or string.lower(answer) == "y" then
        fs.makeDir("/User/Songs")
        shell.run("bbpack get CYRmLz78 /User/Songs")
    end
    return
end

print("Download wave-amp? (music player) Yes/No")

local answer = io.read()
if string.lower(answer) == "da" or string.lower(answer) == "d" or string.lower(answer) == "yes" or string.lower(answer) == "y" then
    if not fs.exists("/Program_Files/wave-amp2/wave-amp2") then
        print("Downloading wave-amp2...")
        shell.run("pastebin get nKyXwuuf /Program_Files/wave-amp2/wave-amp2")
    end
    if not fs.exists("/bbpack") then
        print("Downloading bbpack...")
        shell.run("pastebin get cUYTGbpb /bbpack")
    end

    print("Create shortcut to desktop? Yes/No")

    local answer = io.read()
    if string.lower(answer) == "da" or string.lower(answer) == "d" or string.lower(answer) == "yes" or string.lower(answer) == "y" then
        local file = fs.open("User/Desktop/wave-amp2.lua", "w")
        file.write("shell.run(\"/Program_Files/wave-amp2/wave-amp2\")")
        file.close()
    end

    print("Do you want to install common song library? Yes/No")

    local answer = io.read()
    if string.lower(answer) == "da" or string.lower(answer) == "d" or string.lower(answer) == "yes" or string.lower(answer) == "y" then
        fs.makeDir("/User/Songs")
        shell.run("bbpack get CYRmLz78 /User/Songs")
    end
end