OS 10.12.6

I have NordVPN which quit on me yesterday. I have trashed it and re-installed it 4 times from djfferent sites but it will not open. The enclosed report appears when I try to open it saying it unexpectively quit. Clicking the reopen option just sends a copy to apple. What do they do with it if anything?

Does anyone know why it quit. If so, is there anything I can do in the future to avoid it quitting again?

jaybass

Process: NordVPN IKE [5086]
Path: /Applications/NordVPN IKE.app/Contents/MacOS/NordVPN IKE
Identifier: com.nordvpn.osx-apple
Version: 4.11.7 (76)
App Item ID: 1116599239
App External ID: 828995014
Code Type: X86-64 (Native)
Parent Process: ??? [1]
Responsible: NordVPN IKE [5086]
User ID: 501

Date/Time: 2019-02-21 16:08:53.342 -0500
OS Version: Mac OS X 10.12.6 (16G1815)
Report Version: 12
Anonymous UUID: 2A0D47C9-D8D9-DA94-59CD-2FAAE217A5D7

Sleep/Wake UUID: 2D3763B7-26AD-4F87-936C-79D2170ED93E

Time Awake Since Boot: 2800 seconds
Time Since Wake: 200 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 [0]

Application Specific Information:
Fatal error: 'try!' expression unexpectedly raised an error: Error Domain=io.realm.unknown Code=13 "Permission denied" UserInfo={Category=system, NSLocalizedDescription=Permission denied, Error Code=13}: file /BuildRoot/Library/Caches/com.apple.xbs/Sources/swiftlang_Fall2018/swiftlang_Fall2018-1000.11.42/src/swift/stdlib/public/core/ErrorType.swift, line 184

There is a lot more but I think the above tells the reason, I hope.
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OS 10.12.6 iMac (Retina 5K, 27", 2017, 3.4 GHz Intel Core i5, 24 GB RAM, 2400 MHz DDR4. Sierra. 10.12.6 SuperDuper. 1 TB Lacie HD, Noise Ninja.