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“Kodi” is damaged and can’t be opened. You should move it to the Trash
Hi! I had the same frustrating issue. Nothing from above did work for me but it was very helpful as it was pointing me into the right solution. I found a tip regarding gatekeeper that works: it was about SystemPolicy database where gatekeeper keep its stuff and it could become corrupted. You need to restore it with default values writing this in terminal (the first command is to make a backup):

mv /var/db/SystemPolicy /var/db/SystemPolicyOLD
cp /var/db/.SystemPolicy-default /var/db/SystemPolicy

(found here )

It should work, but if you get a "permission denied" you can do it manually by digging into the var folder at the root level in your system, var is invisible so you can use this to switch invisible items to visible and vice verse

That works for me.
I'm having the same issue... Would somebody be willing to use teamviewer to help me out? PM me please.. This is frustrating. I'm not tech savvy so all these terms Gatekeeper and userdata and shit is confusing tf out of me.
When I initially downloaded Kodi (from the official site) it worked perfectly. But because of a wonky add-on I decided to uninstall and reinstall it. This is the 15th time I'm trying to reinstall and every time I do I get this message:

"Kodi" is damaged and can't be opened. You should move it to the Trash.
Google Chrome downloaded this file today at 8:10 PM from

That last part is different every time. One time it said "mirror" something. What does all this mean and how do I fix it? I have a MacBook Pro and my operating system is MacOS Sierra.
(2017-01-30, 17:06)CouchPie Wrote: There's no need to disable Gatekeeper. In cases were I got the "... is damaged" message for an application, I could fix it with an xattr change via Terminal.
For Kodi try: xattr -rc /Applications/ (works from admin user account, otherwise use sudo but anyhow know what you are doing!)

This was the solution for me, Thanx!!!
I had this problem when being on 17.3, then going back to 16.1 and then back to 17.3 again (and at going back to 17.3 i had this issue about the damage-notice).
FWIW, I had this exact problem with Kodi 17.3 installing under MacOS High Sierra (10.13.1). The initial install went fine, then when I scrapped it (the app + the UserData files), subsequent download/installs would not run: when I tried to start the newly-installed, I invariably got,

     "Kodi" is damaged and can't be opened. You should move it to the Trash."

The solution (though I'm not quite sure why) was indeed to run the following command from Terminal:

xattr -rc /Applications/

which resets the application file's extended attributes. Once I did this, the started and ran fine. Again, I'm not sure how or why this works (or indeed why Kodi installed once, but refused to install thereafter) but I'm glad it did!

“Kodi” is damaged and can’t be opened. You should move it to the Trash00