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I downloaded the extension pack from: https://www.virtualbox.org/wiki/Downloads

Got this file Oracle_VM_VirtualBox_Extension_Pack-5.2.14.vbox-extpack.gz

To install it you have to go to File / Preferences / Extensions / Add In there, it expects you to add a file with the extension vbox-extpack.

Double clicking the file extracts it to a folder without the extension. So, I went to the CLI and did:

gunzip Oracle_VM_VirtualBox_Extension_Pack-5.2.14.vbox-extpack.gz

That resulted in what seemed to be the right file, but when I tried to add it to VirtualBox I got the error:

Failed to open the Extension Pack /Users/givanse/Downloads/Oracle_VM_VirtualBox_Extension_Pack-5.2.14.vbox-extpack.

RTZipGzipDecompressIoStream failed: VERR_ZIP_BAD_HEADER
givanse
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    Odd, when I download it on a Mac or a windows PC I get the file without the GZ file extension. What if you just remove the file extension and double-click on the resultant downloaded file. That should just open VBox with a warning about "you are about to install...." – Steve Chambers Jul 16 '18 at 21:18
  • That was the clue! I was downloading the file with Brave browser and it wasn't decompressing the file. So I went on to download the file with Chrome and it gave me the .vbox-extpack that was needed. – givanse Jul 16 '18 at 21:27
  • Brave bug report: https://github.com/brave/browser-laptop/issues/14757 – givanse Jul 16 '18 at 21:38

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