I still have Vice City installed but it gives me an error like that when installing VC-MP.

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Error opening file for writing:
C:/Program Files/Rockstar Games/Grand Theft Auto Vice City/vc-mp.exe

Click Abort to stop the installation, Retry to try again, or Ignore to skip this file.
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I really need to install VC-MP, i tried to find VC-MP setup file.