I did a fresh install of OSX 10.11.6 (El Capitan) on my old Mac Laptop for the purpose of running a full node.
Downloaded and installed Bitcoin Core 17.0.1 onto the machine’s second internal drive, so as to not fill up the boot drive. After install and launch, it synced al headers then started downloading blocks. After about 4 or 5 minutes it stopped downloading blocks, then it gave me a fatal error message and crashed. Every time I open it it now crashes immediately.
I deleted 17.0.1 and tried to download 16.3 to see if that helped, but 16.3 crashes instantly also.
I tried to open the debug.log file and the console window crashed immediately.