Either you have "Only install apps from identified developers / or from the app store" enabled in security settings, or there's an issue with the download. You can turn this off: https://kb.wisc.edu/helpdesk/page.php?id=25443 You can try to right click on the actual installer app and choose "show package contents". It'll open like a folder and you can view what's inside. See if there's an app you can drag from the folder onto your desktop.

Samsung galaxy A7 telefonon szetetném beállítani a kamerát, de a pligint nem engedi letölzeni.

A beállításoknál próbálkoutam az engefélyezéssel, de sajnos mem sikerült.

@arado1 solution 

Hi There,

 

Kindly follow the below mentioned steps

1. Go to disk utility and eject :
2. Retry the installation.

 

Please revert if the problem persists.

 

Thanks,