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Steam can't write to install dir

Steam gives the error "Steam can't write to its install dir. Make sure you're not trying to run from the disk image." How can I fix this?

This may mean that you are trying to run Steam from the disk image (dmg file) that you downloaded.

Do the following to correct this:

  • Open the dmg file and drag the Steam icon into the Applications folder.
  • Run Steam from the Applications folder

NOTE:

You may also see this error if Steam requires an administrator username and password, but you do not provide them

Problem with Steam?

Contact Steam Support