Installation of Orange3 v3.39.0 fails on Windows 11 with exit code -1073741515

[Mireu-Lab]

Describe the bug
The standalone installer for Orange 3.39.0 (Orange3-3.39.0-amd64.exe) fails during the setup of the conda environment. The process terminates with the error message: "conda" command exited with -1073741515. Cannot continue..

This appears to be related to micromamba.exe failing to execute properly.

To Reproduce
Steps to reproduce the behavior:

1. On a fresh installation of Windows 11 (Version 24H2), download the Orange3-3.39.0-amd64.exe installer.
2. Run the installer with default settings.
3. The installation process proceeds through the package extraction phase.
4. When it reaches the step "Creating a conda env in C:\Users\localhost\AppData\Local\Programs\Orange", the installation fails and shows the error dialog.

Expected behavior
The installation should complete successfully, allowing Orange to be launched.

Actual behavior
The installer aborts and displays the final error message: "conda" command exited with -1073741515. Cannot continue..

System Information

• Operating System: Windows 11 (Version 24H2)
• Architecture: AMD x86-64
• Orange Version: 3.39.0 (Standalone Installer)

Installation Log

Click to expand full installation log

Installing micromamba.exe
Output folder: C:\Users\localhost\AppData\Local\Programs\Orange
Extract: micromamba.exe
Creating an new conda env in "C:\Users\localhost\AppData\Local\Programs\Orange"
Output folder: C:\Users\localhost\AppData\Local\Temp\nsq792F.tmp\Orange-installer-data
Extract: conda-spec.txt
Output folder: C:\Users\localhost\AppData\Local\Temp\nsq792F.tmp\Orange-installer-data
Extract: install.bat
Output folder: C:\Users\localhost\AppData\Local\Temp\nsq792F.tmp\Orange-installer-data
Extract: sitecustomize.py
Output folder: C:\Users\localhost\AppData\Local\Programs\Orange\pkgs
Extract: _openmp_mutex-4.5-2_gnu.conda
Extract: _py-xgboost-mutex-2.0-cpu_0.tar.bz2
Extract: anyio-4.9.0-pyh29332c3_0.conda
Extract: anyqt-0.2.1-pyhd8ed1ab_0.conda
... (omitted for brevity) ...
Extract: zipp-3.23.0-pyhd8ed1ab_0.conda
Extract: zstandard-0.23.0-py311he736701_2.conda
Extract: zstd-1.5.7-hbeecb71_2.conda
Output folder: C:\Users\localhost\AppData\Local\Programs\Orange\pkgs
Installing packages (this might take a while)
Executing: cmd.exe /c install.bat "C:\Users\localhost\AppData\Local\Programs\Orange" "C:\Users\localhost\AppData\Local\Programs\Orange\micromamba.exe"
Creating a conda env in "C:\Users\localhost\AppData\Local\Programs\Orange"
"conda" command exited with -1073741515. Cannot continue.

[Mireu-Lab]

I did some research and found previous issues that seemed similar, but they were mostly from users who had previously installed and then uninstalled Conda.
This was not my case, as I have never installed Conda before on this system.
I asked an LLM about the problem, and it suggested that it might be related to a missing Microsoft Visual C++ Redistributable package.
I can confirm that after installing the latest version of the redistributable package, the installation now completes successfully.
I'm posting this to share the solution.

[markotoplak]

Thank you for reporting the bug and the solution. I am reopening the bug because we need to decide how to make users aware of this (and when exactly this happens).