Foolishly, probably, I have installed the newest Mac system Mojave.  It works for many of the programs, however, for X-Plane 10 AND 11, it "tanks."  Here is the error message I receive:
 
Process:               X-Plane [95481]
Path:                  /Volumes/*/X-Plane.app/Contents/MacOS/X-Plane
Identifier:            com.laminar_research.X-Plane
Version:               ???
Code Type:             X86-64 (Native)
Parent Process:        ??? [1]
Responsible:           X-Plane [95481]
User ID:               501
Date/Time:             2018-10-03 13:49:11.539 -0400
OS Version:            Mac OS X 10.14 (18A384a)
Report Version:        12
Anonymous UUID:        36A990D0-EBA3-F07F-D3A9-F05D19F25A56
Sleep/Wake UUID:       4BDC6D19-79B0-4199-A44D-2BB3EA7E9EAD
Time Awake Since Boot: 630000 seconds
Time Since Wake:       630000 seconds
System Integrity Protection: enabled
Crashed Thread:        0
Exception Type:        EXC_CRASH (Code Signature Invalid)
Exception Codes:       0x0000000000000000, 0x0000000000000000
Exception Note:        EXC_CORPSE_NOTIFY
Termination Reason:    Namespace CODESIGNING, Code 0x1
kernel messages:
VM Regions Near 0 (cr2):
--> 
    __TEXT                 0000000100000000-00000001014bc000 [ 20.7M] r-x/rwx SM=COW  
Thread 0 Crashed:
0                                  0x0000000107ff2000 _dyld_start + 0
Thread 0 crashed with X86 Thread State (64-bit):
  rax: 0x0000000000000000  rbx: 0x0000000000000000  rcx: 0x0000000000000000  rdx: 0x0000000000000000
  rdi: 0x0000000000000000  rsi: 0x0000000000000000  rbp: 0x0000000000000000  rsp: 0x00007ffeefbffba8
   r8: 0x0000000000000000   r9: 0x0000000000000000  r10: 0x0000000000000000  r11: 0x0000000000000000
  r12: 0x0000000000000000  r13: 0x0000000000000000  r14: 0x0000000000000000  r15: 0x0000000000000000
  rip: 0x0000000107ff2000  rfl: 0x0000000000000200  cr2: 0x0000000000000000
  
Logical CPU:     0
Error Code:      0x00000000
Trap Number:     0
Binary Images:
       0x100000000 -        0x1014bbfc7 + (???) <8E63F209-0E6C-3009-CE1D-1EF66BA78878> 
       0x107ff1000 -        0x10806f657 + (625.13) <FD58B2D0-D66F-345E-9679-F2F8DB189359> 
External Modification Summary:
  Calls made by other processes targeting this process:
    task_for_pid: 0
    thread_create: 0
    thread_set_state: 0
  Calls made by this process:
    task_for_pid: 0
    thread_create: 0
    thread_set_state: 0
  Calls made by all processes on this machine:
    task_for_pid: 581192
    thread_create: 0
    thread_set_state: 0
VM Region Summary:
ReadOnly portion of Libraries: Total=30.5M resident=0K(0%) swapped_out_or_unallocated=30.5M(100%)
Writable regions: Total=16.9M written=0K(0%) resident=0K(0%) swapped_out=0K(0%) unallocated=16.9M(100%)
                                VIRTUAL   REGION 
REGION TYPE                        SIZE    COUNT (non-coalesced) 
===========                     =======  ======= 
STACK GUARD                       56.0M        2 
Stack                             8192K        2 
__DATA                            29.6M        5 
__LINKEDIT                        9520K        3 
__TEXT                            21.2M        3 
shared memory                        8K        3 
===========                     =======  ======= 
TOTAL                            124.1M       12 
Model: MacBookPro11,5, BootROM MBP114.0184.B00, 4 processors, Intel Core i7, 2.8 GHz, 16 GB, SMC 2.30f2
Graphics: AMD Radeon R9 M370X, AMD Radeon R9 M370X, PCIe
Graphics: Intel Iris Pro, Intel Iris Pro, Built-In
Memory Module: BANK 0/DIMM0, 8 GB, DDR3, 1600 MHz, 0x80AD, 0x484D54343147533642465238412D50422020
Memory Module: BANK 1/DIMM0, 8 GB, DDR3, 1600 MHz, 0x80AD, 0x484D54343147533642465238412D50422020
AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0x152), Broadcom BCM43xx 1.0 (7.77.61.1 AirPortDriverBrcmNIC-1305.2)
Bluetooth: Version 6.0.8f6, 3 services, 27 devices, 2 incoming serial ports
Network Service: Wi-Fi, AirPort, en0
Serial ATA Device: APPLE SSD SM1024G, 1 TB
USB Device: USB 3.0 Bus
USB Device: Apple Internal Keyboard / Trackpad
USB Device: Bluetooth USB Host Controller
USB Device: USB2.0 Hub
USB Device: USB2.0 Hub
USB Device: USB2.0 Hub
USB Device: USB2.0 Hub
USB Device: CH FLIGHT SIM YOKE USB
USB Device: 2.4G Office Mouse
USB Device: CH PRO PEDALS USB
USB Device: Cruzer Blade
USB Device: Backup+  Desk
USB Device: HD Webcam C615
USB Device: Logitech USB Headset
Thunderbolt Bus: MacBook Pro, Apple Inc., 27.1
My apologies for not understanding what this report is saying.  I have attempted to reinstall High Sierra, however, I can't seem to download the software for it.  Very frustrating.
Any suggestions?
Dan Anderson
[email protected]
P.S.  I attempted to use XP11, but the framerate is insufficient to use effectively.