No mountable file systems

You might encounter the below error when trying to install the game client on an older version of MacOS / OS X. This issue affects OS 10.10 (Yosemite) and earlier.

“The following disk images couldn’t be opened: RuneScape.dmg. no mountable file systems.”


To resolve your issue, first, check your Mac meets our system requirements.

To find out which OS version you are currently using:

  1. From the Apple menu in the corner of your screen, choose 'About This Mac'
  2. You'll see the OS name, followed by its version number


Update your OS version
Note: Please perform any updates at your own risk. Please ensure that your existing software and hardware are compatible with newer OS versions before updating.

  1. In the top left-hand side of your screen click the Apple logo
  2. In the drop-down menu, select 'Software update' and follow the prompts 
  3. Restart your Mac
  4. Download and install the game client

For further information regarding OS updates, please see How to update the software on your Mac on the Apple website.

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