Impossible to install any extension Safari

I hit on my end to try to get the Chrome Safari. I am trying to install some extensions for Safari adblock, ghostery, trafficlight and lastpass.

None of them install. I get an error message "Safari cannot install this extension."

I tried:

Turning off FileVault

Keychain node deletion (it was not)

Restart in safe mode and try to install

After safe mode reboot and try to install

Tried to install directly from developer without going through the extensions Gallery

Remove all personal information in Safari

Beyond the MacBook into a bar of genius, what else I can try?

Using Safari/Safari Extensions to install?

If the problem is still there, try to start safe mode using your account and see if they will be there install.  Disconnect all devices except those necessary for the test. Shut down the computer and then put it up after a 10 second wait. Immediately after hearing the startup chime, hold down the SHIFT key and continue to hold it until the gray Apple icon and a progress bar appear. Startup is considerably slower than normal. This will reset some caches, forces a check for directory and disables all start-up and connection, among other things. When you restart normally, the initial restart may be slower than normal. If the system is operating normally, there may be 3rd party applications that pose a problem. Try to delete/disable the third-party applications after a reboot using the UN-Installer. For each disable/remove, you need to restart if you do them all at once.

Safe mode - on El Capitan

Start Mode without failure-El Capitan.

Tags: Mac OS & System Software

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