ONNX Trainer Download Instructions and Help

A plain-English guide to downloading, verifying, and installing the Fusion ONNX Trainer for Fusion AI Studio.

Fusion ONNX Trainer is the local training runtime used by Fusion AI Studio. It lets AI Studio train models and prepare ONNX files that can be used by Fusion Builder.

This guide covers the installer download, Windows SmartScreen warnings, SHA-256 verification, first install, clean install, and common setup problems.

Table of Contents

1. Before You Download
2. Current Installer File
3. Why Windows May Show A Warning
4. How To Verify The Download
5. How To Install
6. Clean Install Option
7. If Setup Shows Bootstrap Error
8. What To Send Support
9. Frequently Asked Questions

Before You Download

Only download Fusion ONNX Trainer from the official Fusion Indicators download link provided through your account or support email.

Do not run a copy of the installer that was sent through an unofficial file-sharing link, forwarded by another person, or downloaded from a third-party site.

Before installing:

• close NinjaTrader 8
• close any running Fusion AI Studio trainer window
• make sure you have an internet connection
• keep the installer in a normal folder such as Downloads

The first install can take several minutes because Windows prerequisites and Python packages may need to be prepared.

Current Installer File

Current V1.0 installer file name:

FusionONNXTrainerSetup-1.0.0.exe

Current expected SHA-256:

4dc66de825fdeb9e526025ac6340ec1ae564403ae824ee4925be7a61f3638d5d

If the official download page shows a newer SHA-256, use the SHA-256 shown on the official download page for the file you downloaded.

Why Windows May Show A Warning

Fusion ONNX Trainer V1.0 is not code-signed yet. Because of that, Windows may show:

• Windows protected your PC
• Unknown publisher
• a prompt asking whether you want to allow the app to make changes

This warning does not automatically mean the file is unsafe. It means Windows does not yet have a trusted publisher signature or enough reputation for this installer.

Before clicking through the warning, verify the SHA-256 using the steps below. If the SHA-256 matches the official value, the file matches the official Fusion Indicators installer build.

After verifying the file, if Windows shows SmartScreen:

1. Click More info.
2. Confirm the file name is FusionONNXTrainerSetup-1.0.0.exe.
3. Click Run anyway.
4. If Windows asks for permission, click Yes.

How To Verify The Download

SHA-256 is a fingerprint of the exact installer file. If the download is changed, corrupted, incomplete, or replaced with a different file, the SHA-256 value will be different.

PowerShell Method

1. Open PowerShell.
2. Run:

Get-FileHash "$env:USERPROFILE\Downloads\FusionONNXTrainerSetup-1.0.0.exe" -Algorithm SHA256

1. Compare the Hash value to the expected SHA-256:

4dc66de825fdeb9e526025ac6340ec1ae564403ae824ee4925be7a61f3638d5d

If the hash matches exactly, the installer file matches the official build.

If the hash does not match, do not run the file. Delete it and download it again from the official Fusion Indicators link.

Command Prompt Method

If you prefer Command Prompt, run:

certutil -hashfile "%USERPROFILE%\Downloads\FusionONNXTrainerSetup-1.0.0.exe" SHA256

Compare the printed SHA-256 value to the expected value above.

How To Install

1. Close NinjaTrader 8.
2. Run FusionONNXTrainerSetup-1.0.0.exe.
3. Accept the Risk Disclosure when prompted.
4. Accept the Terms and EULA when prompted.
5. Choose the install folder, or keep the default.
6. Choose the FusionTrainerWorkbench folder, or keep the recommended folder under your NinjaTrader 8 documents folder.
7. Leave Clean install unchecked unless support told you to use it or you want to remove old trainer workspace files.
8. Let the installer finish the runtime bootstrap.

The final bootstrap step can take several minutes. During this step, the installer may:

• check for the Microsoft Visual C++ runtime
• check for supported Python
• create the trainer runtime environment
• download Python packages
• deploy ONNX support files for NinjaTrader 8

Do not close the installer while the progress bar is still moving or the details window is still showing setup work.

If Windows asks for permission to install the Microsoft Visual C++ runtime, allow it. ONNX Runtime needs this Windows component.

Clean Install Option

The clean install checkbox deletes existing files in the selected FusionTrainerWorkbench workspace folder before first launch.

Use clean install when:

• support asks you to reset the trainer workspace
• you want to remove old prepared datasets, model files, or workspace files
• you are troubleshooting a broken prior trainer setup

Do not select clean install if you want to keep existing trainer datasets or model files in that workspace.

Clean install should not delete NinjaTrader itself. It is intended for the selected Fusion trainer workspace folder.

If Setup Shows Bootstrap Error

If setup says bootstrap error or says the runtime setup failed, do not keep reinstalling blindly. The installer writes a detailed log here:

%LOCALAPPDATA%\FusionOnnxTrainer\install_bootstrap.log

Common causes include:

• NinjaTrader 8 was still open and locking ONNX support files
• Python is missing or is not a supported x64 version
• Windows blocked or declined the Microsoft Visual C++ runtime prerequisite
• the installer download was incomplete or corrupted
• internet access failed during Python package installation

Supported Python versions for this V1.0 installer are:

• Python 3.11 x64
• Python 3.12 x64
• Python 3.13 x64

If the log says Python is missing or unsupported, install Python 3.13 x64 from the official Python for Windows download page, then run the Fusion ONNX Trainer installer again.

If the log says requirements.txt or another installer file is missing, verify the SHA-256. If the SHA-256 does not match, delete the installer and download a fresh copy from the official link.

What To Send Support

If the installer still fails, send support:

• a screenshot of the error message
• the SHA-256 value shown by Get-FileHash
• the file install_bootstrap.log from:

%LOCALAPPDATA%\FusionOnnxTrainer\install_bootstrap.log

Also mention:

• whether you selected clean install
• whether NinjaTrader 8 was closed
• which Windows version you are using
• whether you saw a Microsoft Visual C++ runtime permission prompt

Frequently Asked Questions

Does the SHA-256 remove the Windows warning?

No. SHA-256 verifies that the file matches the official build. It does not remove SmartScreen or Unknown publisher. Code signing is what improves the Windows publisher warning.

Why did the old installer not show the same warning?

Windows reputation is tied to the exact file and publisher signature. A new unsigned installer build has a new file fingerprint and may show SmartScreen even if an older build did not.

Do I need Python installed before running the installer?

Usually no, but the trainer runtime does need a supported x64 Python. The installer checks for Python 3.11, 3.12, or 3.13 x64 and may try to prepare what it needs. On locked-down Windows environments, manual Python installation may be required.

Should I run the installer as administrator?

Run the installer normally first. If Windows asks for permission during prerequisite setup, allow it. The Microsoft Visual C++ runtime is a Windows-level prerequisite and may require permission.

Can I delete the installer after setup finishes?

Yes, but keeping a copy of the installer and its expected SHA-256 can be useful if support asks which exact build you installed.

This guide reflects the Fusion ONNX Trainer V1.0 installer workflow. Last updated 2026-07-02.