App is damaged and can’t be opened inSierra!

Be aware that this disables Gatekeeper, which is intended to protect your system from malware. Disabling it isn't fixing the problem, it's just bypassing it, and leaves your machine vulnerable (although the risks are currently low you should be aware what you're doing).

Yes NaviD-K, and I still have problems. LastPass seems to have given up on helping me and showed me the door to ask elsewhere. I'll be forced to call apple tech support and if I find out, I'll post what they tell me.

BTW, LastPass is a good product, but I have a bad experience with their support.

Try running this program in your normal account, then copy and paste the output in a reply. The program was created by etresoft, a frequent contributor. Please use copy and paste as screen shots can be hard to read. On the screen with Options, please open Options and check the bottom 2 boxes before running. Click “Share Report” button in the toolbar, select “Copy Report” and then paste into a reply. This will show what is running on your computer. No personal information is shown.

Etrecheck – System Information

Although disabling gatekeeper with:-

spctl --master-disable

will get you apps working, it will also reduce your mac security.

You can add an exception to gatekeeper using the command line.

I would suggest enabling gatekeeper with:-

spctl --master-enable

And instead type:-

spctl --add /path/to/app.app

Obviously change to the path to your app, you can even just drag the app onto the terminal window and the path will be completed for you.

To remove the exception simply change to:-

spctl --remove /path/to/app.app

Hope this helps....

Open your terminal and write: "sudo spctl --master-disable" (Write without "") and hit enter, provide password of your computer, done

you are a life saver!!!

thank you so much!!

I'm curious how you found something like this out!?

I've been searching for a solution for long! 😀 till I stumbled on this one...
glad that it worked for you.. and happy downloads 😁

Worked great, thanks

agreed!
do you have the command line to restore it back?

sudo spctl --master-enable

I'll try that.. thanks :)

do you have to restart the computer after that for hte change to take place?

open terminal type : sudo spctl --master-disable

I have tried on Mac OS High Sierra recently for instaling CleanMyMac 3

I am trying to install Lastpass and it is not working. I tried the terminal command but still get the same message