Painter 2026 (Steam, perpetual) won't launch — 4 rotating "missing DLL" errors for DLLs that are present

I purchased Substance 3D Painter 2026 (perpetual) on Steam. The
application will not launch.

--- SYMPTOMS ---

Launching from Steam: a loading window appears for about a second,
then disappears with no error message.

Launching the .exe directly as administrator: a Windows system error
dialog appears saying a DLL is missing. The DLL named changes between
attempts, cycling through these four:

  - anorigami_sdk.dll
  - Qt6QuickControls2.dll
  - python313.dll
  - Qt6WebEngineWidgets.dll

All four files are physically present in the install folder and appear
intact (python313.dll is 5.84 MB, install folder has 78 items).

--- KEY FINDING: CodeIntegrity blocking ---

Event Viewer > Applications and Services Logs > Microsoft > Windows >
CodeIntegrity > Operational shows 864 Event ID 3033 errors:

"Code Integrity determined that a process (...\Adobe Substance 3D
Painter.exe) attempted to load ...\embree3.dll that did not meet the
Enterprise signing level requirements."
RequestedPolicy: 2 / ValidatedPolicy: 1

This was caused by Windows Smart App Control. I have now disabled Smart
App Control (registry VerifiedAndReputablePolicyState = 0x0) and no new
3033 events are logged. The application still fails to launch.

--- sp_log.txt ---

[WARN] <Qt> QCommandLineParser: option not expecting values:
"enable-analytics-logging"
[ERR] <Qt> "[DBG ERROR][Main]" "Uncaught exception : No mapping for the
Unicode character exists in the target multi-byte code page."

Note: my Windows user profile path contains non-ASCII (Korean)
characters.

--- SYSTEM ---

OS: Windows 11 (clean install, June 2026)
CPU: [FILL IN]
GPU: [FILL IN]
RAM: [FILL IN]
Install path: D:\SteamLibrary\steamapps\common\Substance 3D Painter 2026
Steam client on C:, library on D:
Antivirus: Windows Defender only, no third-party AV

--- ALREADY TRIED (no effect) ---

1.  Verify integrity of game files (multiple times)
2.  Full uninstall and reinstall of Painter
3.  Reinstall of the Steam client itself
4.  Reinstall of Microsoft Visual C++ Redistributable (x64)
5.  Removed system-wide Python 3.13 installation
6.  Windows Defender quarantine: empty
7.  Added D:\SteamLibrary to Defender exclusions
8.  Released the one Controlled Folder Access block found
9.  Disabled Smart App Control + reboot
10. Confirmed no new CodeIntegrity 3033 events after the above

--- QUESTIONS ---

1. Are embree3.dll and the other listed DLLs unsigned in the Steam build
   of Painter 2026? Are signed binaries planned?

2. Does the "No mapping for the Unicode character" error mean Painter
   cannot handle a non-ASCII Windows user profile path? If so, is there
   a supported workaround other than creating a new Windows account with
   an ASCII username?

3. Is there any other Windows mechanism that could still block these
   DLLs after Smart App Control is off?

Log file, CodeIntegrity event XML, and error screenshots attached.

I would appreciate any guidance. I am working to a fixed deadline and
have lost a full day to this.

CodeIntegrity Log

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\CI\Policy VerifiedAndReputablePolicyState REG_DWORD 0x0

Code Integrity determined that a process (\Device\HarddiskVolume5\Program Files (x86)\Steam\steamapps\common\Substance 3D Painter 2026\Adobe Substance 3D Painter.exe) attempted to load \Device\HarddiskVolume5\Program Files (x86)\Steam\steamapps\common\Substance 3D Painter 2026\embree3.dll that did not meet the Enterprise signing level requirements.

로그 이름: Microsoft-Windows-CodeIntegrity/Operational 원본: Microsoft-Windows-CodeIntegrity 날짜: 2026-08-02 오전 1:00:39 이벤트 ID: 3033 작업 범주: (1) 수준: 오류 키워드:  설명: Code Integrity determined that a process (\Device\HarddiskVolume5\Program Files (x86)\Steam\steamapps\common\Substance 3D Painter 2026\Adobe Substance 3D Painter.exe) attempted to load \Device\HarddiskVolume5\Program Files (x86)\Steam\steamapps\common\Substance 3D Painter 2026\embree3.dll that did not meet the Enterprise signing level requirements. 이벤트 Xml: <Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event"> <System> <Provider Name="Microsoft-Windows-CodeIntegrity" Guid="{4ee76bd8-3cf4-44a0-a0ac-3937643e37a3}" /> <EventID>3033</EventID> <Version>0</Version> <Level>2</Level> <Task>1</Task> <Opcode>111</Opcode> <Keywords>0x8000000000000000</Keywords> <TimeCreated SystemTime="2026-08-01T16:00:39.2033997Z" /> <EventRecordID>783</EventRecordID> <Correlation ActivityID="{f5d604d3-21c3-0002-6005-f6f5c321dd01}" /> <Execution ProcessID="22336" ThreadID="9960" /> <Channel>Microsoft-Windows-CodeIntegrity/Operational</Channel> <Computer>DESKTOP-48PU38T</Computer> <Security UserID="S-1-5-21-3943767050-2274503919-2758342397-1001" /> </System> <EventData> <Data Name="FileNameLength">104</Data> <Data Name="FileNameBuffer">\Device\HarddiskVolume5\Program Files (x86)\Steam\steamapps\common\Substance 3D Painter 2026\embree3.dll</Data> <Data Name="ProcessNameLength">123</Data> <Data Name="ProcessNameBuffer">\Device\HarddiskVolume5\Program Files (x86)\Steam\steamapps\common\Substance 3D Painter 2026\Adobe Substance 3D Painter.exe</Data> <Data Name="RequestedPolicy">2</Data> <Data Name="ValidatedPolicy">1</Data> <Data Name="Status">3236495362</Data> </EventData> </Event>