I'm trying to install the Mono MDK, and downloaded the .pkg for 4.2.1 (about 200 MB), when I double click on the package, it opens a "verifying xxxxxMDKxxxxx.pkg" window, which does nothing for over an hour while the Installer icon bounces on the dock. Is there a way to bypass the verification or force it to verify? Or, alternatively is there a way to install the Mono MDK using the command line? I'm running a early 2011 Macbook Pro on OSX 10.11

5 Answers 5


Ran into this with some other software, but wanted to pass on a tip I picked up.

In finder, launch /System/Library/CoreServices/Installer.app. It will prompt you to locate a .pkg file to install. Navigate to the .dmg volume you've mounted, and select the xxxxxMDKxxxxx.pkg file.

Installation should proceed normally from there.

  • 5
    Why does this happen?
    – tofutim
    Commented Jun 25, 2016 at 6:06
  • Not Mono pkg specific - I've seen it twice now (same computer) with Virtualbox. Still no idea what's causing, suspect some bug w/ Gatekeeper.
    – Orangutech
    Commented Jul 1, 2016 at 19:26
  • Works on El Capitan 10.11.5 Commented Jul 14, 2016 at 21:03
  • Most probably introduced with El Capitan. Never seen such silly bugs in OS X on previous versions. After descovering a lot of issues in all versions of OS X after Yosemite - I tried to stay on it as long as possible, but unfortunately latest macbook doesn't support earlier versions - now have to heck with this Capitan degradation :(
    – Daniel
    Commented Feb 25, 2017 at 14:29

For installer:

  1. Open the Finder
  2. Navigate to Go menu
  3. Select the Go to Folder submenu.
  4. Copy the file path into it.
  5. Press Enter
  6. Locate the .dmg or .mpkg package.
  7. Voila you are done.

Not a verified answer but I can't comment: try to disable Rootless System Integrity as indicated here.

Source: OSXDaily says "Mac users may need to disable rootless SIP protection in OS X before being able to successfully install Java, but you can enable it again after it has been installed. If you get stuck on “verifying…” during the installation process of Java, it’s because of rootless."


For me it was enough to move the .pkg file from the virtual installer drive to my desktop.


This might help


That video worked for me, at least.

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