Is there a free trial?

Yes. Start a free 3-day trial from your account at codefizz.dev/account, no credit card required. The trial unlocks the full Pro plugin for UE 5.6, 5.7 and 5.8 on one machine. When it ends, upgrade to a paid plan and the same key keeps working with five machine seats. There is also a separate free, open-source community edition (Unreal MCP).

Which Unreal Engine versions are supported?

UE 5.6, 5.7 and 5.8 on Win64. Each release ships as a separate binary plugin matched to the engine ABI, and the cfa CLI downloads the build that matches the engine you point it at. Future engine versions are added as they release.

Which platforms are supported?

Right now, Windows 64-bit only. The plugin is built and tested on Windows for this first release. Linux and Mac support are on the roadmap and will be added when there is clear demand from paying customers. I would rather wait until I can properly test those builds end to end than ship binaries I have not run myself. If you are on Mac or Linux and would buy the plugin today, drop a note in Discord or send me an email. That is how the priority for adding those platforms gets set.

Do I need a license key, and how do I enter it?

Activate from the CLI with your CodeFizz website account. Install or update the free cfa CLI, run cfa login, and sign in in the browser. That machine is activated and the editor plugin reads the same sign in, with nothing to paste inside Unreal. Offline grace still applies. A license key remains under License and billing for recovery and older cfa builds (cfa login --key), but new setups should use browser login only.

What MCP clients work with the plugin?

Any MCP-compatible client. The plugin exposes a TCP bridge and the Go CLI ships separately, so Claude Code, Cursor, VS Code, Gemini, and other MCP hosts all work out of the box.

Can I cancel anytime?

Yes. Open your account at codefizz.dev/account and click Manage billing to open the Polar billing portal, then cancel in one click. You keep access through the end of your billing period and stop being charged afterward.

What happens to my installed plugin if I cancel?

You keep the version you installed and it keeps working. Your license stays valid after you cancel, so the plugin does not switch off. You stop receiving new releases and you lose access to the private Discord and roadmap. The plugin you paid for is yours to keep.

Do you offer refunds?

No refunds on subscriptions, since the plugin is downloadable software you get immediately. You can cancel any time and keep access through the end of the period you have already paid for. If you ran into a real bug or a feature you reasonably expected to be there, email me and we will figure it out. Full policy on the Refund Policy page in the footer.

Why is Patron more expensive when I get the same plugin?

Patron is for people who want to influence the direction of CodeFizz Editor Agent, with voting, a private roadmap, priority answers, and direct input on new APIs. If you just need the plugin and updates, stay on Pro.

Is there a free version?

Yes. There is a free, open-source community edition (Unreal MCP) that gives you the core bridge and a basic command set, which is great for trying the workflow. The paid Pro edition is the fully maintained build with the complete toolset (Niagara, PCG, StateTree, Insights, and more), regular updates, and support. The open-source edition is linked in the footer.

Studio / team licensing?

For studios needing multiple seats, an enterprise tier is available off-platform. Contact directly for pricing.

Troubleshooting

Fixes for common issues: the plugin failing to load on Unreal 5.8 (GetLastError 126, module could not be loaded), bridge unreachable, wrong editor targeted, license or activation problems, and plugin version mismatches.

Most issues come down to a handful of things: the plugin will not load, the editor is not open, you reached the wrong editor, the license needs a sign-in, or an install is on an old build. Each has a quick fix below.

Plugin fails to load (GetLastError 126)

If the editor stops at startup with Plugin 'CodeFizzEditorAgent' failed to load because module 'CodeFizzEditorAgent' could not be loaded, and the log shows GetLastError=126 with a missing UnrealEditor-WorldStreamingInsights.dll (even though that file is present), this was a bug in plugin builds before 1.2.44. It showed up mainly on Unreal 5.8 projects opened with the launcher-installed engine. Your setup is fine, there is nothing to reinstall from Epic. Updating the plugin fixes it.

Close the Unreal Editor first (the plugin file is locked while it runs), then update every install to the newest build, or reinstall it for the one engine:

Update the plugin everywhere it is installed:

bash

cfa update-all

Or reinstall the newest build for one engine:

bash

cfa install-plugin "C:/Program Files/Epic Games/UE_5.8"

Note

1.2.44 stops linking a couple of Unreal's experimental Insights plugins that ship turned off by default, so there is no longer any DLL for the editor to miss. Reopen your project after updating and the error is gone. Confirm your version any time with cfa plugin status.

Bridge unreachable

If a command reports the bridge is unreachable, the editor is not running (or the plugin is not enabled). Open your project in the Unreal Editor, enable the plugin if prompted, then re-run:

Confirm the bridge is up and see which editor you reached:

bash

cfa health_check

Note

A healthy result reports the project name, full .uproject path, engine version, pid, and port. A "status": "error" means no editor is up.

Wrong editor targeted

If a change landed in the wrong project, you have more than one editor open. List them and pick the one you mean, then continue. See Multiple Editors for the full flow.

See every running editor:

bash

cfa list_editors

Choose the one you want:

bash

cfa connect jiggi

Plugin shows inactive

The editor plugin reads the same sign-in as the CLI, so there is nothing to paste inside Unreal. If the CodeFizz panel does not read Active, sign in on this machine and press Refresh in the panel.

Check this machine's sign-in and expiry:

bash

cfa whoami

Plugin version mismatch

If a command behaves oddly after an update, check what is installed and reinstall the newest build.

See what is installed where and whether it is current:

bash

cfa plugin status

Reinstall the newest build for an engine:

bash

cfa install-plugin "E:/Unreal/UE_5.8"

Tip

Still stuck? Email contact@codefizz.dev with the command you ran and its output.

Loading…

PreviousFAQ NextFor AI Agents

Plugin fails to load (GetLastError 126)

Close the Unreal Editor first (the plugin file is locked while it runs), then update every install to the newest build, or reinstall it for the one engine:

Update the plugin everywhere it is installed:

bash

cfa update-all

Or reinstall the newest build for one engine:

bash

cfa install-plugin "C:/Program Files/Epic Games/UE_5.8"

Note

Bridge unreachable

If a command reports the bridge is unreachable, the editor is not running (or the plugin is not enabled). Open your project in the Unreal Editor, enable the plugin if prompted, then re-run:

Confirm the bridge is up and see which editor you reached:

bash

cfa health_check

Note

A healthy result reports the project name, full .uproject path, engine version, pid, and port. A "status": "error" means no editor is up.

Plugin version mismatch

If a command behaves oddly after an update, check what is installed and reinstall the newest build.

See what is installed where and whether it is current:

bash

cfa plugin status

Reinstall the newest build for an engine:

bash

cfa install-plugin "E:/Unreal/UE_5.8"

Tip

Still stuck? Email contact@codefizz.dev with the command you ran and its output.