the problem is that Mac quarantines spm12 and does not allow it to communicate with other programs. The solution is:

Go to terminal and run this command: sudo xattr -r -d com.apple.quarantine /Users/*urusername/**Downloads/spm12

*the user who installed the software initially on ur Mac (etc. you or someone else) 
com.apple.quarantine can only be removed by user that installed the software
** location of the folder that you downloaded SPM into.