FreeFileSync 14.10 installer exits silently on Windows 11 24H2 (Build 26200) in corporate environment

[piscesz]

Hello,

I would like to report a reproducible installation problem with FreeFileSync 14.10.

Environment
-----------
- FreeFileSync version: 14.10
- Windows 11 24H2
- Build: 10.0.26200.6584
- x64
- Installed with Administrator privileges
- Corporate PC
- AhnLab V3 antivirus installed
- Microsoft Defender disabled

Problem
-------
The installer starts normally.

I can proceed through the installer pages until the final installation step.

After clicking "Next" (installation starts), the installer exits silently without displaying any error message.

No FreeFileSync installation directory is created.

The following directories do NOT exist after installation:

C:\Program Files\FreeFileSync
C:\Program Files (x86)\FreeFileSync

Observed behavior
-----------------
I collected the following diagnostics:

1.
ProcDump
- All installer processes exit normally.
- Exit Code = 0

2.
WinDbg
No application crash was detected.
The dump only shows normal process termination.

3.
Process Monitor
No ACCESS DENIED or SHARING VIOLATION was observed during installation.

The installer creates and runs:

FreeFileSync_14.10_Windows_Setup.exe
-> FreeFileSync_14.10_Windows_Setup.exe
-> FreeFileSync_14.10_Windows_Setup.tmp
-> FreeFileSync.exe

All of these processes exit with Status 0.

4.
Installer log

The Inno Setup log contains the following message:

"Cannot obtain process information.
Error code 5: Access is denied [OpenProcess(1932)]"

PID 1932 is dwm.exe.

However, there is no subsequent fatal error message in the installer log.

I have these log files but due to their file sizes , I cannot attach them to this report.
--------------
- ffs_install.log
- Procmon PML trace
- ProcDump full dumps
- WinDbg analysis

Question
--------
Is this expected behavior?

Could the installer be terminating because OpenProcess() fails for a protected Windows process (dwm.exe), or is there another known compatibility issue with Windows 11 Build 26200 or corporate security software?

Please let me know if additional logs or traces would be useful.

Thank you.

[Zenju]

Looks like most likely the installation crashed. Windows "helpfully" hides this by default, apparently hoping nobody would notice.
https://learn.microsoft.com/en-us/windows/win32/wer/collecting-user-mode-dumps