Fixing problems
Fusion tries to say what went wrong in plain words. Here are the common ones and what to do.
Fusion doesn't start¶
- "Windows protected your PC" when installing: the installer isn't code-signed yet. Click More info, then Run anyway.
- Your antivirus removed it or blocks it. Some tools distrust a new program that starts and talks to other programs. Restore it from quarantine and allow
%LOCALAPPDATA%\Programs\Fusion, then tell us which antivirus it was. - It closes right away. The launcher saves a report in
%LOCALAPPDATA%\Fusion\crashes\. If it happened right after an update, accept its offer to go back to the version before.
A game doesn't start, or stops¶
| Fusion says | What to do |
|---|---|
| Not installed | Install the game, or check it's in a Steam library Fusion can see. |
| Needs setup | Press Set up in My Games. |
| close the game first | Fusion starts games itself. Close the game, then press Play again. |
| … left its crash reporter open | A game that crashed can leave its crash reporter running, and Steam won't start the game again. Press Close it. |
| Version mismatch | The game updated and its router hasn't caught up. Wait for the router's update, or try a community router. |
| anti-cheat is running | The game's anti-cheat is on. Only its official offline mode works with Fusion. |
| stopped | The game closed or crashed. Fusion keeps running; press Esc and try again. Out of video memory? Close other programs (browsers use a lot). |
It runs, but badly¶
- Slow or stuttering: two games share your graphics card. Press F6 to see what each uses. Fusion runs games you aren't looking at slower, and puts them to sleep when memory runs low.
- The picture is a frame behind when you turn: some games draw a little late; their router's page on steonmod.com says how far behind it measured.
- The picture is stretched: make Fusion's window the same shape as the game's.
Telling us what broke¶
Post in the Help forum with:
- what you played (the scenario or Experience) and which games;
- what Fusion said, word for word;
- the crash report, if there is one (
%LOCALAPPDATA%\Fusion\crashes\), and Fusion's version (the main menu's bottom line).
Turning on Settings → Compatibility reports helps everyone: router makers see which game versions work.
Questions¶
Do I need Steam? Not for Fusion. Your games may need it to start.
Is it free? Yes. Fusion and routers are free, always.
Can I play online with friends? Not yet. Fusion is for single-player games, and multiplayer fusions aren't built.
Does it work on Linux, Mac or Steam Deck? Not yet: Windows only for now.
Why is the app called Fusion and the site SteonMod? SteonMod is the project; Fusion is the app. The final names may change.