Plex and Plex HTPC not working on macOS High Sierra

[edgley]

Hi,
My old install of High Sierra used to run both versions fine.
After a re-install, neither of them open.
A box appears saying that:
Plex cannot be opened because of a problem.

The first part of the crash report seems to be about a Framework problem.
Not sure what to do other than ask here, please, if someone understand what might be going on.

I have the first part of the report and here it is:

Process: Plex [2092]
Path: /Applications/Plex.app/Contents/MacOS/Plex
Identifier: tv.plex.desktop
Version: 1.69.1 (1.69.1)
Code Type: X86-64 (Native)
Parent Process: ??? [1]
Responsible: Plex [2092]
User ID: 501

Date/Time: 2023-05-22 09:19:31.609 +0100
OS Version: Mac OS X 10.13.6 (17G14042)
Report Version: 12
Anonymous UUID: F350D959-1257-3464-CC96-C5E789977EA8

Sleep/Wake UUID: 39D68439-AEA7-446C-91D3-B80AE142FC52

Time Awake Since Boot: 14000 seconds
Time Since Wake: 450 seconds

System Integrity Protection: enabled

Crashed Thread: 0

Exception Type: EXC_CRASH (SIGABRT)
Exception Codes: 0x0000000000000000, 0x0000000000000000
Exception Note: EXC_CORPSE_NOTIFY

Termination Reason: DYLD, [0x4] Symbol missing

Application Specific Information:
dyld: launch, loading dependent libraries

Dyld Error Message:
Symbol not found: _NSAppearanceNameDarkAqua
Referenced from: /Applications/Plex.app/Contents/MacOS/…/Frameworks/QtCore.framework/Versions/A/QtCore (which was built for Mac OS X 10.14)
Expected in: /System/Library/Frameworks/AppKit.framework/Versions/C/AppKit
in /Applications/Plex.app/Contents/MacOS/…/Frameworks/QtCore.framework/Versions/A/QtCore

[tom80H]

It looks like Plex have updated some of the external components (Qt framework) to a version that no longer supports Mac OS X 10.13 but require at least 10.14. In that case your best shot will be to rollback to the previous version of those apps and stick with those (or preferably upgrade your system to keep up )

[FordGuy61]

New minimum version for HTPC and Desktop players for MacOS

Due to a update of a component required for some fixes to the HTPC and Desktop apps, 1.37.3 of HTPC and 1.67.2 of Plex for macOS are the last version macOS 10.13 can run. Version 1.38.2 of HTPC which requires macOS 10.14 was released mistakenly released before disabling the auto updater for that version. If you are running macOS 10.13, you can get the previous version of HTPC 1.37.3.3706 here and Plex for macOS 1.67.2.3705 here.

Plex Media Server support ending for older versions of Windows (7, 8, and 8.1), macOS (10.11, 10.12)

Starting with version 1.32.0 (planned for public release on April 10th), Plex Media Server will no longer support versions of Windows older than Windows 10 (version 1607) or macOS older than 10.13 (High Sierra). While older versions of the Server may continue to run in these now-unsupported environments for the time being, we encourage everyone to upgrade their systems to at least Windows 10 (version 1607) or macOS 10.13 (High Sierra) to ensure that both your operating system and Plex Media Ser…

[edgley]

Thank you, I failed to see the Announcements, but did see that the system requirements, on the download page, still stated High Sierra.

As for upgrading, I am running the latest version of macOS that my system allows.