First run, instead of double-clicking, right click & select Open.
Alternatively, disable SIP & you get this option back, in Security & Privacy…
… though you still get some 'are you sure?' messages, you can just say 'OK'
The easiest way to type Turkish is to use one of the Turkish input sources supplied by Apple. Make sure you have the Turkish flag showing in the top right corner of the screen (just adding it to Input Sources preferences is not enough). To see which key does what, use the Keyboard Viewer.
Another way is to add the input source called ABC Extended to the ...
I had Mojave 10.14.1 installed on a solid state drive with Mac OS Extended (Journaled).
I keep regular Time Machine backups, if you don’t, find a way to make your backup first, you’ll need it.
I shutdown my Mac Pro and unplugged my Apple Tower (which I choose to connect via LAN, instead of WiFi.
I booted into recovery mode, opened Disk Utility, and erased ...