Problem description: Unable to install CNA 6.3 on macOS Siera
I was unable to install CNA 6.3 on macOS Siera. I was able to download the zip file and unzip the installer, but when executing the installer, the following dialog box appeared:
"cna_mac_k9_6_3_en" is damaged and can't be opened. You should move it to the Trash. Options are "Cancel" which cancels the installation, and "Move to Trash" which does just what it says on the tin.
Solution:
Open a Terminal window, cd to the directory where the unzipped contents of the CNA 6.3 download are located and execute the following command:
user@MacBook-Pro ~/Downloads$ xattr -rc cna_mac_k9_6_3_en.app
If successful, this command terminates silently. Next, in Finder, double-click on cna_mac_k9_6_3_en and the installation will proceed normally.
Brief analysis:
macOS Siera does not allow you to run unsigned apps without executing the command above. The '-r' flag causes xattr to operate recursively on all files in the directory. The '-c' flag causes all attributes to be removed.
