I install the client (Nextcloud-2.6.4.20200303.pkg) onto my Mac running Catalina 10.15.3. I try to connect to my helm server (which works on my iPhone) and I get a blue bar on a blank window. The logs say:
Process: QtWebEngineProcess [2699]
Path: /Applications/nextcloud.app/Contents/Frameworks/QtWebEngineCore.framework/Versions/5/Helpers/QtWebEngineProcess.app/Contents/MacOS/QtWebEngineProcess
Identifier: QtWebEngineProcess
Version: ???
Code Type: X86-64 (Native)
Parent Process: nextcloud [2693]
Responsible: nextcloud [2693]
User ID: 501
Date/Time: 2020-03-14 10:30:33.895 -0600
OS Version: Mac OS X 10.15.3 (19D76)
Report Version: 12
Anonymous UUID: CF1F98A4-7B3E-2FFB-C660-33D152645120
Time Awake Since Boot: 1700 seconds
System Integrity Protection: enabled
Crashed Thread: 0 CrRendererMain Dispatch queue: com.apple.main-thread
Exception Type: EXC_BAD_ACCESS (Code Signature Invalid)
Exception Codes: 0x0000000000000032, 0x00000034f9505a60
Exception Note: EXC_CORPSE_NOTIFY
Termination Reason: Namespace CODESIGNING, Code 0x2