If it helps, this is the error message I'm seeing when trying to run it:
Process: openxcom [2343]
Path: /Applications/openxcom.app/Contents/MacOS/openxcom
Identifier: SupSuper.openxcom
Version:
Code Type: X86-64 (Translated)
Parent Process:
[1]
Responsible: openxcom [2343]
User ID: 501
Date/Time: 2020-11-26 18:26:05.922 +0000
OS Version: macOS 11.0.1 (20B29)
Report Version: 12
Anonymous UUID: [removed]
Sleep/Wake UUID: [removed]
Time Awake Since Boot: 2500 seconds
Time Since Wake: 160 seconds
System Integrity Protection: enabled
Crashed Thread: 0 Dispatch queue: com.apple.main-thread
Exception Type: EXC_BAD_INSTRUCTION (SIGILL)
Exception Codes: 0x0000000000000001, 0x0000000000000000
Exception Note: EXC_CORPSE_NOTIFY
Termination Signal: Illegal instruction: 4
Termination Reason: Namespace SIGNAL, Code 0x4
Terminating Process: exc handler [2343]